1) Which layer is the thinnest part of Earth? a) mantle b) crust c) outer core d) inner core 2) The mantle is made mostly of: a) Iron and Nickel b) Solid rock c) Semi-solid rock d) Liquid metal 3) The inner core is solid because of: a) Iron and Nickel b) High pressure c) Thin thickness d) Liquid iron 4) The ________crust is thicker (30-50 km) and less dense than the crust (5-10 km). a) Oceanic; Continental b) Mantle; Core c) Inner; Outer d) Continental; Oceanic 5) The core is divided into two parts: the ______core (liquid) and the ______ core (solid). a) Inner; Outer b) Outer; Inner c) Mantle; Crust d) Continental; Oceanic

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