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