The Tides Cornell Notes page 57 How does

The Tides Cornell Notes page 57 “How does the moon affect the earth? ”

What is Gravity? • Natural phenomenon by which all physical bodies (anything with mass) attract each other • holds celestial bodies together • keeps celestial bodies in orbit

What effect does the moon have on Earth? • Tides- • rise and fall of water levels due to gravitational forces • Occur twice a day (2 high tides, 2 low tides) http: //home. hiwaay. net/~krcool/Astro/moontides/

high tide low tide

How are Tides created? • (3 ways) 1. Because the Earth and the moon are attracted to each other http: //home. hiwaay. net/~krcool/Astro/moontides/

Moon and earth are attracted to each other by gravity

Tides are also created by: • 2. the rotation of the earth • 3. and the sun’s gravity

The sun can affect the tides, too Spring Tides

Tides are not waves!

What are Spring tides? • Tides that produce the greatest difference between high and low tides— The highest high tide and lowest low tide • Occur twice a month

When do spring tides occur? Spring Tides combined with big storms • Once at the full moon and once at the new moon • When the sun moon and earth are nearly in a line

Spring Tides –the sun and the moon line up

What are NEAP Tides? • Tides that produce the least difference between high and low tides—the lowest high tides and highest low tides • Occur twice a month

When do neap tides occur? • Once at the first quarter and once at the third quarter • When the sun moon and earth are at right angles to each other http: //www. space. gc. ca/asc/eng/educators/resources/astronomy/multimedia/module 3/tides. swf

The neap tides –the smallest tides – when the sun and moon are at a 90 angle

• What other effects do we have from the moon? ?