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