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

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

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

A) Rotation
B) Atmosphere
C) Temperature
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) Changes in the sun's intensity
D) The Earth's changing distance from the sun

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

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

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

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