Transcript How the moon affects earth.

How the moon
affects earth.
Motions of the moon
• The moon rotates on its axis once every
27.3 days.
• The moon revolves around the earth once
every 27.3 days.
• Therefore, a “day” and a “year” on the
moon are the same length!
• The same side of the moon, the near side,
always faces earth. We never see the far
side of the moon.
Phases of the moon
• The different shapes of the moon that we see
from earth are called its phases.
• Phases are caused by the position of the earth,
moon and sun and those positions change every
day.
• The phase of the moon we see depends on the
amount of the sunlit side of the moon that faces
earth.
• Moon phases-moon phases code cfp 5013
tides
• The rise and fall of oceans’ water every 12.5 hours.
• Caused by the differences in how much the moon’s
gravity pull on different parts of the earth.
• Spring tides- greatest difference in low and high tides.
Occurs when sun, moon and earth are aligned in a
straight line.
• Neap tides- least difference in low and high tides. Occurs
when moon is at right angles to earth and sun.
• Animation:
http://www.sfgate.com/getoutside/1996/jun/tides.html
eclipses
• When the shadow hits Earth or moon’s Earth’s shadow hits the
moon, an eclipse occurs.
• Eclipse-caused when an object in space comes between the sun
and another objects, casting a shadow on that object.
• Solar eclipse- occurs at the new moon phase when the moon
passes between Earth and the sun, blocking the sunlight from
reaching Earth.
• Animation of solar eclipse:
• http://www.teachersdomain.org/resources/ess05/sci/ess/eiu/totalecli
pse/index.html
• Lunar eclipse- occurs at a full moon when Earth is directly between
the moon and the sun.
• Animation of a lunar eclipse:
• http://www.classzone.com/books/earth_science/terc/content/visualiz
ations/es2504/es2504page01.cfm?chapter_no=visualization