1) What is the atmosphere? a) The solid outer layer of Earth b) The layer of gases surrounding Earth c) The water covering Earth’s surface d) The heat coming from the Sun 2) Which gas makes up the largest percentage of Earth’s atmosphere? a) Oxygen b) Carbon dioxide c) Nitrogen d) Hydrogen 3) One important function of the atmosphere is to — a) Block all sunlight from reaching Earth b) Protect Earth from harmful radiation c) Stop all meteors from entering space d) Prevent wind and weather from happening 4) Without the atmosphere, what would most likely happen to Earth? a) Life would not survive b) Oceans would grow larger c) Earth would stop rotating d) Days would become longer 5) Why is oxygen in the atmosphere important? a) It helps plants grow taller only b) It allows humans and animals to breathe c) It creates weather patterns d) It keeps the Moon in orbit

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