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

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 amount of moisture in the air
C) The speed of the wind
D) The state of the atmosphere at any particular time

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

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

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

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

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

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

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