A) A coal burning generator B) An automobile that operates on fuel cells C) A wood burning stove D) A gasoline burning automobile
A) The moon B) Running water C) Heat from within the Earth's crust D) The sun
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) Rotation B) Atmosphere C) Temperature D) Magnetic Field
A) The sun causes plants to wither and die B) The sun powers life on Earth 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) Changes in the sun's intensity D) The Earth's rotation
A) It makes it's own light B) It reflects light from Earth C) It reflects light from stars D) Because it reflects sunlight
A) Mountains B) Deep craters C) Sunken plains, or seas D) High plateaus
A) Light B) Motion C) Heat D) Electricity
A) Temperature and pressure B) Lift and thrust C) Motion and time D) Wind and rain |