1) What layer is made of cold and strong rocks?  a) Mantle b) Outer Core c) Inner Core d) Asthenosphere e) Crust f) Moho's Discontinuity 2) What is the thickest layer of the Earth? a) Crust b) Moho's Discontinuity c) Mantle d) Outer Core e) Inner Core f) Asthenosphere 3) This is the only layer in liquid state. a) Crust b) Outer Core c) Inner Core d) Mantle e) Moho's Discontinuity f) Asthenosphere 4) What planet is in the same size of the Earth's core? a) Saturn b) Uranus c) Neptune d) Jupiter e) Mars f) Venus 5) What is the the average temperature in the outer core? a) 1500°C b) 3000°C c) 2000°C d) 4000°C e) 5000°C f) 6000°C 6) What is the average temperature in the inner core? a) 5000°C b) 1000°C c) 2000°C d) 3000°C e) 4000°C f) 500°C 7) What makes the outer core liquid? a) Low pressure b) High density c) Low density d) High Temperature e) Low temperature f) High pressure 8) What makes the inner core solid? a) Low pressure b) High pressure c) High temperature d) Low temperature e) High density f) Low density 9) This is the ratio of the mass and volume of a substance. a) Energy b) Force c) Power d) Temperature e) Density f) Length 10) This is the amount of space an object occupies. a) Mass b) Volume c) Temperature d) Force e) Area f) Perimeter 11) How many percent does the mantle occupy in the Earth's total volume? a) 55% b) 43% c) 21% d) 68% e) 80% f) 77% 12) How many percent does the mantle occupy in the Earth's total mass? a) 75% b) 68% c) 71% d) 95% e) 66% f) 79% 13) Who discovered Mojo's Discontinuity? a) Andreaja b) Andrei c) Andrea d) Andreja e) Andy f) Andreya 14) What elements compose the Earth's core? a) Calcium and sodium b) Oxygen and potassium c) Aluminum and iron d) Iron and nickel e) Aluminum and silicon f) Hydrogen and helium 15) How thick is the Earth's mantle? a) 32km b) 2900km c) 1000km d) 3200km e) 5000km f) 1500km

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