1) Which layer of the atmosphere is closest to the Earth? a) Exosphere b) Troposphere c) Stratosphere d) Thermosphere e) Mesosphere 2) Which of the following is not a part of the biosphere? a) Animals b) Plants c) Humans d) Lights 3) Too much ______________ in the atmosphere causes global warming? a) Oxygen b) Ozone c) Nitrogen d) Carbon Dioxide 4) Which of the 4 Earth's systems has the least amount of matter of all them? a) Biosphere b) Geosphere c) Hydrosphere d) Atmosphere 5) Ozone is found in which layer of the Atmosphere? a) Exosphere b) Stratosphere c) Thermosphere d) Troposphere e) Mesosphere 6) Which rock forms when magma has cooled and hardened? a) Sedimentary Rock b) Igneous Rock c) Metamorphic Rock

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