8th grade-Ch. 1 Sec. 4 Earth's MoonPresentation Transcript
Ch. 1 Sec. 4 Earth’s Moon
Activity-Why do craters look different from each other? Which object left the largest crater? Which object left the deepest crater? Object Diameter of circle- 20 cm Diameter of circle- 50 cm Diameter of circle- 100 cm (1 m) Small marble Large marble Rubber ball
Features on the moon’s surface include craters, highlands, and maria.
Astronomers have given names to many of the moon’s craters and maria.
features on Moon’s surface seen by Galileo with telescope craters highlands maria round pits formed by meteoroid impacts not volcanoes mountains
dark, flat areas-
ancient lava flows
once thought to be
Ocean of Storms Sea of Tranquility
No atmosphere Moon characteristics size & density temp. & atmos. water
130 o C -180 o C dry & airless
no liquid water
may have ice
best theory of moon’s origin
4.5 billion yrs. ago- planet sized object hit Earth
2. material from Earth’s outer layer broke off 3. material thrown into orbit 4. formed moon
Time to Review
Name 3 major features of the moon’s surface.
How did the moon’s craters form? meteoroid impacts
Why is the moon’s surface much more heavily cratered than Earth’s surface?
Water, wind, and other forces wore away craters on Earth. There is no wind or liquid water on the moon.
Describe the range of temperatures on the moon.
130 o C to -180 o C
(266 o F to -292 o F)
What is the relationship between the moon’s surface gravity, lack of an atmosphere, and temperature range?
The moon’s weak surface gravity allows gases to escape into space, so the moon has no atmosphere, resulting in widely varying surface temperatures.
What was the solar system like when the moon formed?
The solar system was full of rocky debris.
Explain the various stages in the formation of the moon.
A planet-sized object collided with Earth.
Material was ejected into orbit around Earth and formed a ring.
Gravity caused this material to combine into the moon.