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

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

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

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

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

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

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

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