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