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

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

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

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

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 changing distance from the sun
C) Changes in the sun's intensity
D) The Earth's rotation

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

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

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

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