A) A coal burning generator B) An automobile that operates on fuel cells C) A gasoline burning automobile D) A wood burning stove
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 speed of the wind C) The number of clouds in the sky D) The state of the atmosphere at any particular time
A) Temperature B) Rotation C) Atmosphere 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 rotation B) The tilt of the Earth on it's axis C) The Earth's changing distance from the sun 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) High plateaus C) Sunken plains, or seas D) Deep craters
A) Electricity B) Motion C) Heat D) Light
A) Motion and time B) Temperature and pressure C) Wind and rain D) Lift and thrust |