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

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

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

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

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

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

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

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

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