A) An automobile that operates on fuel cells B) A coal burning generator C) A wood burning stove D) A gasoline burning automobile
A) The sun B) Heat from within the Earth's crust C) The moon 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) Temperature B) Atmosphere C) Magnetic Field D) Rotation
A) The sun causes plants to wither and die B) The sun powers life on Earth C) The sun protects life on Earth D) The sun damages life on Earth
A) The tilt of the Earth on it's axis B) Changes in the sun's intensity C) The Earth's changing distance from the sun D) The Earth's rotation
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) Deep craters B) Sunken plains, or seas C) High plateaus D) Mountains
A) Heat B) Motion C) Electricity D) Light
A) Temperature and pressure B) Lift and thrust C) Motion and time D) Wind and rain |