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

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

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

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

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

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

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

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

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

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