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

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

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

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

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

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

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

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