What Are Tides?
The  NOAA San Francisco Tide Station, in operation for more than 150 years.
The NOAA San Francisco Tide Station, in operation for more than 150 years.

Author: Author unknown
This is the National Ocean Service website, U.S. Department of Commerce.
Overview: Explains how tides are caused by gravitational pull of the moon and sun.
Last updated: unknown.
Date reviewed: 5/15/2018
Reviewed by: Jamie Carr
Accuracy: The information seems accurate and up to date, especially because of the source it's from.
Readability and clarity: It is easy to read, short and straight to the point. I think the audience could be anyone that just wants a basic idea of what tides are.
Ease of navigation: There isn't much else to find on tides on this website, but there is a lot of other interesting information. Like what they do, videos, etc...


the tides explained
the tides explained

Author: unknown
Overview: This website talks about the gravitational pull causing the tides, but it also mentions another "major factor" that is less often mentioned, that the force created by the rotation of the earth as well.
Last updated: unknown
Date reviewed: 5/15/2018
Reviewed by: Jamie Carr
Accuracy: The information seems accurate and up to date.
Readability and clarity: It's clear to read, and easy to follow. I think it's meant for students and a help aid for teachers as well.
Ease of navigation: Easy to navigate, it has a lot of information for other astronomy aspects as well. It even has some courses to take!

The Ocean's Tides Explained
external image moon_l.gif

Author: unknown
Overview: "The alternating pattern of rising and falling sea level with respect to land is what we know as the tides. What causes this "motion of the ocean"? In one word, gravity. Specifically, the gravitational forces of the Sun and Moon." (MoonConnection.com)
Last Updated: unknown
Date reviewed: 5/15/2018
Accuracy: The information I read from this website seems correct and accurate.
Readability and clarity: It is easy to read, it gives you more information that just the basics so that you understand the concept better. I really like that!
Ease of navigation: I really like this website, it has a lot of information about the moon! Like- apollo missions, phases of the moon, which phase of the moon is best to fish, etc...

What causes high tide and low tide? Why are there two tides each day?
external image tides.gif
Author: unknown
Last Updated: unknown
Date Reviewed: 5/15/2018
Accuracy: It seems accurate and correct, just a difficult explanation.
Readability and clarity: I feel like this website explains it more difficulty than the other websites. It's probably intended for an adult, or someone slightly experienced in the way this works.
Ease of navigation: Easy website to navigate, it has a lot of other information on there. It also has a section called science vs myth, which I think it a cool section to look at!

Earth Science for Kids: Ocean Tides
Low and high tides change with the Moon
Low and high tides change with the Moon

Author: Ken Nelson
Overview: Easily explains how tides occur, cycles of a tide, tides and the moon, tidal currents, tidal range, types of tides, and interesting facts about tides.
Last Updated: unknown
Date Reviewed: 5/15/2018
Accuracy: Accurate, and very educational! This website goes into easy-to-understand detail!
Readability and clarity: It's intended for kids, hence the title. I think it's a great resource for kids because it explains the concepts clearly, and also goes into all of the different information about tides! Could also be used by parents or teachers to get a general knowledge on tides to teach children.
Ease of navigation: Easy to use website, a great site for kids/teachers/parents. It has lots of information on all of the different subjects- history, geography, science, and biography...

Edited by: Jamie Carr
Date: Spring/2018
Previous Editor: Alicia Soto

Everyone knows that our ocean waters rise and fall at different times of the day. But have we ever wondered where the water goes
when this happens or even what causes the sea level to rise and fall? I know we might be thinking "perhaps the weather", but the weather
has nothing to do with tides. In fact it has been proven that the moon is the cause of tides; but what does the moon have to do with it?
The reason for this page is to help us find these answers in better explanation and better understanding.

How Do Tides Work?

Edited By: Bronwyn Harris
Last Updated: April 9, 2018
Reviewed: Jamie Carr
Date Reviewed: 5/15/2018
Summary: This website is short but yet easy to understand. It looks very accurate; although its condensed, it gets straight to the point.
This website is intended for any one who is interested in the basics of tides. It simplifies what causes tides, how they happen, and
the diferent types of tides there are.

Types of Tides

Edited By: Steve Wiener, Madeline Nevins, Edwin Schiele
Reviewed By: Jamie Carr
Date Reviewed: 5/15/2018
Summary: This website is intended for teachers and students. It is really helpful in explaining the types of tides and how
the moon creates the different tides. It also explains how one can predict tides and gives a lot of information on diferent topics along with
some tide tables. It is fairly simple to read.

Reviewed By: Jamie Carr
Date Reviewed: 5/15/2018

Summary: This website gives a good description of what a tide is, how tides work and when to expect them. Also, the different types of
tides, tides in rivers. It has a tide table and looks very accurate and this educational website is intended to those who are into fishing and are
interested in knowing the best times and worst times to fish. This website has a lot of different information.

Tidal Power

Ducksters. Technological Solutions, Inc.
Date Updated: December 2012
Reviewed By: Jamie Carr
Date Reviewed: May 15th, 2018
Summary: For this last website I wanted to add tidal power because I didnt know what tidal power was. This is a website for kids and teachers.
very simple to follow and accurate. it explains what tidal power is, renewable energy, how we get power from waves, history and a lot of other fun
facts about tidal energy.

Edited by: Jamie Carr
Previous editor: Kristen Simanek
Have you ever been sitting on the beach watching the waves and wondered to yourself, what causes these waves? Why we have different tides at different times of the day? Well, that will all be explained for you.

High Tide / Low Tide Examples in Relation to the Moon Phases


Effect of Tides on our waters

external image inout-tide.gif


  • The website was found on May 4, 2009. last updated: 7/28/2018 reviewed on: 5/15/2018 by Jamie Carr
  • The intended audience is teachers,the general public and others who may be interested in this site would be curious minds.
The site was fairly easy to follow. It has the basic information about tides. The contents of the site focused solely on tides and how one can make predictions of when the tides would be at their highest or lowest. The site has experimental research for individuals who may be interested in learning about a more specify topic such as; Moon, phases of the moon, low or high Tides, etc . There is data provided which can be plotted onto a graph to determine the day and time of the high and low tides. At the top of the page, anyone browsing the site can “ask an expert” “project guides/ideas” or “compete in advance science competitions.
  • In my opinion, this website is educational for those who may want to further their understanding of tides and to be able to predict their high and low periods. It is a good site because it provides hands-on experiment.

[[http://www.iit.edu/~johnsonp/smart00/lesson4.htm]] Author: Porter Johnson
  • The website was found and reviewed on May 5, 2009.
  • Reviewed on 5/15/2018 by Jamie Carr
  • The website seems to be intended for students, teachers or anyone who might be interested in tides.
The site is easy to follow it gives the readers subtitles if they are looking for a specific topic on tides gives a fair amount of information towards each subtitle but, you may need further information and it gives you a link to another website. Has a list of links to frequently asked questions on the subject of tides.

  • The website was found and reviewed on May 6, 2009.
  • The website is intended for all audiences: students, teachers, and youngsters alike.
  • This website is easy to follow and gives you the all basic information about tides. What causes them, the spring and neap tides, and also states a few key terms on tides. The website contains a animated video that shows how the moons gravitional pull affects the tides causing high and low tides.The little "click here' links on the page do not really do any sort of help. It gives a few basic diagram pictures to help with the understanding.

[[http://members.tripod.com/~CovenK/index.html]] Hosted by: Tripod
  • The website was found and reviewed on May 6, 2009.
  • The intended for this website are high school students and the general public. The site can also be useful to those who enjoy being on the beach and want to understand the flow of the ocean beneath their feet.
  • The website provides clear understanding to those who have wanted to know why the ocean behaves differently at different times of the day. It gives a little history of when and who discovered the law of gravity. This site explains of why the moon controls the ocean’s Tides. The site is very basic and easy to understand. No special knowledge is required to understand the writer’s points. On the left of the page, there are other links that go into more depth about the types of tides.
  • In my opinion, the educational value of this site is good. It gives a very general idea and overview of what Tides are and what causes them. This website is set up in a way that a person reading would obtain knowledge about tides.

  • The website was found and reviewed on May 7, 2009.
  • The website is intended for amateurs, high school students, and the general public.
  • While reading this website you find that it is extremely easy to follow. It goes over the topic of what are tides and what it is that causes them. It gives little "click here" links but, they are not really any help . It gives few basic diagrams for helping with the ideas of spring and neap tides.

Author: Richard Pogge
The website is intended for professionals and teachers. The general public who are interested in the topic Tides may find this site useful.
  • The website gives basic information about tides, it is set up with a subtitles followed by bullets but, the bullets are not explained well. Gives good diagrams on the moons gravity affecting the tides and also on spring and neap tides.

[[http://home.hiwaay.net/~krcool/Astro/moon/moontides/]] Copyrights: Keith Cooley
  • The website is intended for, high school and college students, and the general public.
  • The site is very lengthy but easy to understand. Details are broken in sections and then better explained to its audiences. The sites motion illustration demonstrates when the different Tides periods occur in accordance with the moon phases and times. The contents of the site are easy to comprehend and no special knowledge is required for the intended audience. The information about Tides is clearly stated.

  • Though the site is lengthy, it provides the audience easy flow of information. The educational value is excellent. The information is précised and illustration made it even easier to grasp the concepts of Tides.
  • This website is very easy to follow and to understand. It gives information about how the moon affects tides. The site also has plenty of diagrams along with the reading that gives you a further understanding and clears things up. The site also states some of their refrences that can help you get a further or better understanding of tides.
  • This website has absolutely no reading at all but, it is a video diagram that shows how the moon and sun affect the tides. It clearly shows with the moon rotation how the tides change. It also gives little explainations all through the video to help with further understanding.

by:Diederik Willemsen
  • This website gives plenty of information about the tidal movements. Easy to follow, the site has illustrations and a small moving diagram showing the moons affects on tides. It also gives an overview of the website that is very useful.
  • The site gives the basic information on tides and shows diagrams. It is easy to follow and the diagrams are very helpful. It is set up with subtitles that are followed by information on that topic

This section provides links that illustrate how Tides are created, how we observe them, and how we know they exist. Tides are the periodic rise and fall of the ocean waters caused by gravitational pulls of the Moon and Sun (to a lesser extent), as well as the rotation of the Earth. Some well known Tides are Spring Tide, Neap Tide, and Lunar Tides. When the Sun, Earth and moon are in a straight line, this causes a Spring Tide. The spring tides create high tides that are very high and low tides that are really low. When the sun and the moon are the right angle of each other, this is called a Neap Tide. The neap tides create high tides that are very low and low tides that are very high. The sun also pulls at the Earth but, not as nearly as strong as the moon.

The Jump

Date reviewed: May 15, 2018
Viewed by: Jamie Carr
You may think that there is only one high tide at a time on Earth, but the truth is, that there is two different high tides on Earth at the same time. How is this possible? The tides come from the gravitational pull from the moon, and the centrifugal force to cause the high tide on the opposite side of the moon. The reason there is two high tides about every twelve hours is that you have a tide when closer to the moon, and then again when the moon is opposite from you.

National Oceanic and Atmospheric Administration

Last updated: March 25, 2008
Date reviewed: May 15, 2018
Reviewed by: Jamie Carr
A tide is from the sun and moons force. We have high tides and low tides. They rise up towards the coast, all fall back into the sea. The incoming tides are called flood tides. The tides going away are called an ebb current.

The Highest Tides

Author: Dr. Roy Bishop
Date reviewed: May 15, 2018
Reviewed by: Jamie Carr
The moon gives a force to the earth, then the earth pushes closer to the moon. With that, the water is closest to the moon, which makes the tides bigger. The reason for the high tides on the opposite side of the earth are because the force that the earth is being pulled toward the moon, the tide gets held which pushes the tide to be bigger.