A) A gasoline burning automobile
B) An automobile that operates on fuel cells
C) A wood burning stove
D) A coal burning generator

A) The sun
B) Heat from within the Earth's crust
C) The moon
D) Running water

A) The amount of moisture in the air
B) The number of clouds in the sky
C) The state of the atmosphere at any particular time
D) The speed of the wind

A) Temperature
B) Atmosphere
C) Rotation
D) Magnetic Field

A) The sun protects life on Earth
B) The sun powers life on Earth
C) The sun damages life on Earth
D) The sun causes plants to wither and die

A) The tilt of the Earth on it's axis
B) The Earth's rotation
C) The Earth's changing distance from the sun
D) Changes in the sun's intensity

A) It reflects light from stars
B) It makes it's own light
C) Because it reflects sunlight
D) It reflects light from Earth

A) Mountains
B) Deep craters
C) High plateaus
D) Sunken plains, or seas

A) Electricity
B) Motion
C) Light
D) Heat

A) Temperature and pressure
B) Wind and rain
C) Motion and time
D) Lift and thrust