The Earth’s Tides Page 63

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/moon/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/moon/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 raise 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 biggest tides Occur twice a month

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

The sun can raise the tides, too 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 smallest 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/module3/tides/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??