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 sun C) Running water D) The moon
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) Magnetic Field C) Rotation D) Temperature
A) The sun damages life on Earth B) The sun causes plants to wither and die C) The sun powers life on Earth D) The sun protects life on Earth
A) The tilt of the Earth on it's axis B) The Earth's rotation C) Changes in the sun's intensity D) The Earth's changing distance from the sun
A) It reflects light from Earth B) It makes it's own light C) It reflects light from stars D) Because it reflects sunlight
A) High plateaus B) Sunken plains, or seas C) Deep craters D) Mountains
A) Heat B) Motion C) Electricity D) Light
A) Motion and time B) Wind and rain C) Temperature and pressure D) Lift and thrust |