the earth’s tides
DESCRIPTION
The Earth’s Tides. Page 63. Tides -. rise and fall of water levels due to gravitational forces Occur twice a day (2 high tides, 2 low tides). What effect does the moon have on Earth?. http://home.hiwaay.net/~krcool/Astro/moon/moontides/. high tide. low tide. How are Tides created?. - PowerPoint PPT PresentationTRANSCRIPT
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??