1. We can find the very liquid phase of materials in: (a) Outer core. (b) Mantle. (c) Inner core. (d) Lithosphere. 2. Earth crust is composed of the: (a) Largest variety of rocks. (b) Igneous and metamorphic rock silicates. (c) Iron with some nickel and other elements. (d) Limestone and sandstone. 3. Density (in gm/cm) of the oceanic crust equals to: (a) 3.0 (b) 2.7 (c) 5 (d) 10.8 4. Asthenosphere is the: (a) Weak part of the upper mantle. (b) Lower mantle. (c) Crust and the strong part of the upper mantle. (d) Outer core. 5. One of the other properties of minerals is: (a) Hardness. (b) Radioactivity. (c) Luster. (d) Density.

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