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Chapter 25 Part 1
Chapter 25
19
Science
9th Grade
10/04/2010

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Cards

Term
What are the oldest parts of the moon? Why?
Definition
The highlands. Because they are the most hit with craters.
Term
What are the youngest parts of the moon?
Definition
The Marias
Term
What are the dark parts of the moon?
Definition
The dark parts of the moon are the basins and level plains.
Term
The light areas of the moon.
Definition
the lunar highlands (rugged mountains)
Term
Where are the higher gravity readings of the moon?
Definition
The circular parts of maria.
Term
Why are some places higher in gravity?
Definition
It means that the material beneath the surface has a different density from that of the surrounding rock.
Term
What are rays?
Definition
A bright streak of shattered rock and dust that radiates from a lunar crater
Term
Name the things that determine the length of the rays.
Definition
Larger object=Larger ray...Faster object=Larger Ray...Shallower angle=LArger Ray
Term
Marias are?
Definition
basaltic magma filled basins
Term
what are mascons?
Definition
a maria with higher gravity readings
Term
rilles are?
Definition
trenches that formed from flowing lava
Term
pits created by meteoroids
Definition
Craters
Term
Regolith
Definition
Lunar soil..no water...
Term
One rev. of the moon is how many days?
Definition
27 1/3
Term
Lunar month?
Definition
29.5 days
Term
Why is there a difference in time
Definition
because of the earth's movement in its orbit
Term
The moons rotation=?
Definition
revolution rate
Term
The mass is?
Definition
1/18 of earths
Term
Which has a higher density moon or earth?
Definition
moon
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