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