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