1) How many layers does the Earth have? a) one b) two c) three d) four 2) What is the name of the thinnest layer of the Earth? a) the crust b) the mantle c) the outer core d) the inner core 3) What layer of the Earth consists of tectonic plates? a) the crust b) the mantle c) the outer core d) the inner core 4) What are the tectonic plates? a) the Earth's core b) slabs of the rock c) liquid iron d) the mantle 5) What is the name of the center of the Earth? a) the crust b) the mantle c) the outer core d) the inner core 6) What is magma? a) solid rock b) lava c) hot melted rock d) ash 7) What makes magma push up to the Earth's surface? a) cool water b) heat and pressure c) lava d) tectonic plates 8) Where do most volcanoes occur? a) Asia b) mountains c) plate boundaries d) the ocean 9) Why do some volcanoes happen on the inside of the plates? a) hot spots b) very hot summers c) lots of weight d) rock is dense 10) How is the island chain in Hawaii formed? a) the tectonic plates collided b) tsunami c) hot spot d) tropical winds

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