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Earth Science
Chapter 25 MOON
16
Science
9th Grade
09/24/2010

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Term
Astronomy
Definition
study of the universe
Term
Meteoroid
Definition
celestial body that can be as small as a speck to an object weighing thousands of kilograms
Term
craters
Definition
depressions (holes) in the moons surface caused by impacts to moon
Term
micrometeoroids
Definition
tiny objects no larger then grains of sand
Term
Maria
Definition

dark areas on moon

represent great basins and level plains

Term
mascons
Definition
areas of higher gravity
Term
rille
Definition
trenchlike valleys running thru maria bedrock
Term
rays
Definition
bright streaks that radiate from a number of craters evidence suggest they consist of shattered rock and dust
Term
regolith
Definition
means loose rock materials called this because lunar soil is not really soil. contains no water or organic material
Term
Phases of moon
Definition
daily changes in the moon's appearance as veiwed from earth
Term
Phases of moon
Definition

Waxing

waning

gibbous

Term
Waxing
Definition
from earth face of the moon changes from all dark to all light (new moon to full moon) in 2 weeks during this time said to be waxing
Term
Waning
Definition
next 2 weeks face of moon gradually cahnges from all light back to all dard (full moon back to new moon)
Term
Gibbous phases
Definition
almost all of the bright half of moon faces earth. when full entire bright half faces earth each phase occurs two times a month
Term

Lunar Eclipses

 

Umbra

 

penumbra

Definition

Shadow cast by any opaque object has 2 parts (umbra and penumbra)

 

area of total shadow

 

area of partial shadow

 

 

Term
solar eclipse
Definition
When the Earth's shadow prevents sunlight from reaching the moon.
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