earth's motion Flashcards
what are the two types of movement of earth?
- rotation around its axis
- revolution around the sun
how are the seasons created?
the difference in energy received from the sun
how is difference of energy influenced?
earth’s tilt
the more sunlight is spread, ___ energy is received
less
duration of sunlight has a large effect since more sunlight = ____ energy
more
the earth’s tilt makes the days shorter in _____ and longer in ____
winter / summer
summer in northern hemisphere– earth is tilted ____ the sun = receives sunlight at a higher angle for _____ periods of time
toward / longer
winter in northern hemisphere– earth is tilted ___ from the sun= receives sunlight at a lower angle for ______ periods of time
away / longer
what are the two types of movement of the moon?
- rotation around its axis
- revolution around the earth
how many times does the moon rotate when it completes one orbit around earth?
once
why is the moon bright?
it reflects the sunlight
only ____ the moon is illuminated by the sun
half
what is a lunar eclipse?
when earth’s shadow covers the moon
what is a solar eclipse?
when moon’s shadow covers the earth
what is the umbra?
a region of complete shadow, which a complete eclipse will occur
what is the penumbra?
a fringe region of partial shadow, which a partial eclipse will occur
if the moon, earth and sun were on a flat plane, there should be a lunar eclipse every ____
month
how often do eclipses happen?
twice a year
what causes tides?
gravitational force
what is gravitational force?
the moon attracts water, making the tide higher
everyday, there are __ high and ____ low tides
two / two
