[Free Registration/Login may be required to access all resource tools.] Reveals tidal patterns and that tides are caused by the gravitational attraction of the Sun and Moon to Earth.

[Free Registration/Login may be required to access all resource tools.] This study guide summarizes key points about the different types of tides and the Moon's effect on Earth's tides. Includes a few questions to check for understanding.

This site explains what tides are and the difference between Proxigean Spring Tides, spring tides, and neap tides, and how these are formed. Graphic illustrations are provided.

Discusses the different kinds of tides, high and low tides, lunar tide facts, questions people have asked about tides, and causes of tides.

This interactive resource adapted from the National Park Service describes the many forces that affect shorelines, including tides, weathering, erosion, and deposition. Includes background reading handout and discussion questions.

For middle grades. Using your knowledge of tides, answer the following questions.

A simple one-page explanation of oceanic tides. Includes instructions for completing a tide-mapping activity.

Understand where tides come from. This brief article illustrates and describes the science behind high and low tides as well as why some places experience only one high and low in a twenty-four hour period.