Unit 3 Flashcards
(34 cards)
What is the speed an object needs to move away from a body to not be drawn back by gravity
Escape Velocity
How hot is the core of the earth
6,500 degrees kelvin
What is the newest and “best” theory explaining how the moon was created
Giant Impact Theory
How often does the magnetic field change
200,000 to 300,000 years
The upper layer of earth’s crust and mantle is called what?
Lithosphere
How do astronomers know the composition of the moon
Direct sampling
What is an event that causes the rotation of the earth to slow down? (Due to the moon)
The moon’s gravitational pull
Sheets of shattered and pulverized rock on the surface of the moon
Rays
Doughnut rings surrounding the earth, protecting us from the sun’s charged particles
van Allen radiation belt
How old is the earth
4.543 billion years old
How old is the moon
4.53
What is the best theory believed for the creation of earth’s atmosphere
The volcanic activity released gases that made an early atmosphere
What is the center of the earth still hot
Only the crust has cooled down
When the atmosphere traps infrared light and prevents the heat form escaping
Greenhouse effect
Causes the earth to wobble and eventually will cause the winter to become longer
Tilt
What causes the earth and other planets in the solar system to have a round shape
Gravitational pull from all sides
What are the bright areas on the moon made of calcium and aluminum called?
Highlands
What type of element gives the planet earth its great density
Iron
What is the earth’s greatest geological mystery
How it was formed
What happens to the density of particles in the atmosphere the higher it extends
It be becomes less dense and the air pressure decreases
What causes the aurora
When charged particles from the sun strike atom’s in the earth’s atmosphere
Why is it believed the backside of the moon has a thicker crust
The earth’s gravitational pull
Which Apollo mission was the first to land of the moon
Apollo 11
What are the bright large pits on the surface of the moon
Crater
