A) A coal burning generator B) An automobile that operates on fuel cells C) A gasoline burning automobile D) A wood burning stove
A) Heat from within the Earth's crust B) The moon C) Running water D) The sun
A) The number of clouds in the sky B) The amount of moisture in the air C) The state of the atmosphere at any particular time D) The speed of the wind
A) Atmosphere B) Magnetic Field C) Temperature D) Rotation
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 Earth's rotation B) Changes in the sun's intensity C) The Earth's changing distance from the sun D) The tilt of the Earth on it's axis
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) Light B) Electricity C) Heat D) Motion
A) Wind and rain B) Motion and time C) Temperature and pressure D) Lift and thrust |