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