A) A coal burning generator B) An automobile that operates on fuel cells C) A gasoline burning automobile D) A wood burning stove
A) Running water B) Heat from within the Earth's crust C) The moon D) The sun
A) The speed of the wind B) The amount of moisture in the air C) The number of clouds in the sky D) The state of the atmosphere at any particular time
A) Rotation B) Magnetic Field C) Atmosphere 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) The Earth's changing distance from the sun D) Changes in the sun's intensity
A) It makes it's own light B) It reflects light from stars C) Because it reflects sunlight D) It reflects light from Earth
A) Deep craters B) Mountains C) Sunken plains, or seas D) High plateaus
A) Electricity B) Heat C) Motion D) Light
A) Temperature and pressure B) Wind and rain C) Motion and time D) Lift and thrust |