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

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

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

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

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

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

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

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

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

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