A) A coal burning generator B) A wood burning stove C) A gasoline burning automobile D) An automobile that operates on fuel cells
A) Heat from within the Earth's crust B) The sun C) The moon D) Running water
A) The amount of moisture in the air B) The speed of the wind C) The state of the atmosphere at any particular time D) The number of clouds in the sky
A) Atmosphere B) Temperature C) Magnetic Field D) Rotation
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) Changes in the sun's intensity B) The Earth's rotation C) The Earth's changing distance from the sun D) The tilt of the Earth on it's axis
A) Because it reflects sunlight B) It reflects light from stars C) It makes it's own light D) It reflects light from Earth
A) Sunken plains, or seas B) High plateaus C) Deep craters D) Mountains
A) Motion B) Heat C) Electricity D) Light
A) Temperature and pressure B) Motion and time C) Lift and thrust D) Wind and rain |