Earth In Space

Front 1

crater

Back 1

depression formed by impact of meteorites or comets; the more craters in a region, the older the surface

Front 2

lunar eclipse

Back 2

occurs during a full moon, when the Sun, the Moon, and Earth line up in such a way taht the Moon moves into Earth's shadow

Front 3

moon phases

Back 3

changing views of the Moon as seen from Earth, which are caused by the Moon's revolution around Earth

Front 4

solar eclipse

Back 4

occurs during a new moon, when the Sun, the Moon, and Earth are lined up in a specific way and Earth moves into the Moon's shadow

Front 5

axis

Back 5

imaginary line around which Earth spins; drawn from the north geographic pole through Earth to the south geographic pole

Front 6

equinox (EE kwuh nahks)

Back 6

twice-yearly time when the Sun is directly above Earth's equator and there are equal hours of day and night

Front 7

orbit

Back 7

a curved path followed by Earth as it moves around the Sun

Front 8

revolution

Back 8

the motion of Earth around the Sun, which takes about 365 1/4 days, or one year, to complete

Front 9

rotation

Back 9

the spinning of Earth on its axis every 24 hours, which causes day and night

Front 10

solstice

Back 10

time when the Sun reaches its greatest distance north or south of Earth's equator