chapter 12 test Flashcards
(40 cards)
spring tides occur when what?
when the moon and the sun are aligned
tides are caused mainly by…
the moons gravitational uneven effect on earth
when do neap tides occur?
when the moon is in a right angle to the earth
maria on the moons surface were formed by…
volcanoes and lava flows
gallaleo said that the moon had round formations known as…
craters
where would you find water on the moon?
towards the north and south poles
how big is the moon?
a quarter of the earth: 1/4 of the diameter
temperature on the moons surface varies because the moon has…
no atmosphere
the earths rotation takes about (how long?) …
1 day or 24 hours
day and night are caused by…
earth’s rotation
what’s a revolution of the earth and how long does it take?
a revolution is: one orbit around the sun and it takes 1 year
why does earth have seasons?
because it’s tilted on its axis
how many degrees is the earth tilted?
23.5
because the earth is tiled the latitudes 23 1/2 degrees north, and 23 1/2 degrees south, are called what?
the tropics
the north pole is tilted toward the sun, so north america experiences what?
summer time
when does the summer solstice occur in australia?
december 21
when does an equinox occur?
when day and night are both 12 hours
all objects are attracted to each other by what force?
gravity
what two things determine the strength of gravity?
mass and distance
what two factors keep the earth in orbit around the sun and earth in orbit around the moon?
velocity (due to the circular motion) & gravity
the tendency of a moving object to keep moving is..
inertia
the phase of the moon depends on what?
the moons potition of where it is around earth
what’s a solar eclipse?
when the moon casts a shadow on the earth
when can you get a lunar eclipse?
when the earth is between the moon and the sun
