1) Water is ___________________________resource. a) an ariticial b) a renewable 2) The type of soil that allows water to pass through it is a) permeable b) impermeable 3) A mixture of gases present on Earth is a) air b) water 4) The _______ layer of soil is made up of a solid rock. a) lower b) upper 5) The presence of a harmful substance in the environment is called ________________ a) pollution b) environment 6) The _________ is used to generate electronicty, steel and make cement. a) coal b) petroleum 7) The _______ is a raw material mainly used as fuel for transportation and generate electricity. a) coal b) petroleum 8) ____________________ is the variety of living things that inhabit the planet, the relationship they have with others and the environment around them. a) renewable resources b) native species c) biodiversity 9) ________occur naturally in a place without being introduced by humans. a) native species b) exotic species c) pest 10) The natural gases (oxygen, carbon dioxide, and various) trap energy which allows Earth to maintain a balance of energy in ecosystem and prevent the Earth from freezing. They are called _______. a) fossil fuels b) greenhouse gases c) climate change

Science Chapter 12

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