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