1) There are about _____ different minerals in the world. a) 100 b) 500 c) 10,000 d) 20,000 e) 2,000 f) 2 2) Below the subsoil is a layer of rock which geologists call ____. a) topsoil b) bedrock c) crust 3) This hot, liquid rock is called ____. a) core b) mantle c) humus d) magma 4) Scientists who study the earth? a) geologists b) urologists c) pediatricians d) dentist 5) The decayed material is the soil is called ____. a) gold b) gems c) humus 6) The upper layer of soil is called ____. a) soil b) subsoil c) core d) topsoil 7) Diamonds, rubies and emeralds are called ____. a) humus b) crystals c) minerals d) gems 8) Bedrock is a part of the earths ____. a) topsoil b) mantle c) core d) crust 9) There are about 2,000 different minerals in the world but only about ____ of them are common. a) 1,000 b) 900 c) 150 d) 50 e) 30 f) 100 10) Beneath the layer of topsoil is the ____. a) bedrock b) subsoil c) topsoil d) many e) mantle

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