1) How old is Earth? a) 3.6 billion b) 4.6 billion c) 4.5 billion d) 4.6 million 2) What is the proportion between water and land on Earth? a) 71% and 29% b) 50% and 50% c) 89% and 11% d) 85% and 15% 3) What is the proportion between saline water and fresh water? a) 92.5% and 7.5% b) 95% and 5% c) 97.5% and 2.5% d) 80% and 20% 4) How high is the Mount Everest? The highest point on Earth? a) 8.9 km b) 7.9 km c) 12.6 km d) 15 km 5) How deep is the Mariana trench? The deepest point on Earth? a) 23.9km b) 10.9 km c) 22 km d) 13 km 6) What is Earth's crust thickness? a) 70 km b) 20 km c) 50 km d) 45 km 7) What is the hottest part of the Earth? a) Lower mantle b) Outer core c) Upper mantle d) Inner core 8) What is the correct order of the atmosphere? a) Troposphere, stratosphere, mesosphere, thermosphere and exosphere b) Exosphere, mesosphere, thermosphere, troposphere and stratosphere c) Stratosphere, thermosphere, troposphere, mesosphere and exosphere d) Troposhere, stratosphere, thermosphere, mesosphere and exosphere 9) How long has been humans living on Earth? a) 200,000 years b) 300,000 years c) 150,000 years d) 250,000 years 10) How many percent is human living on earth compared to its life? a) 0.04% b) 0.004% c) 0.4% d) 4%

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