a. 1. Multiple Choice. 1. Why is Earth called "the living planet"? It sustain life c. It has water at the surface b. It has atmosphere d. All of the above 2. Which among the set of planets are called terrestrial? a. Jupiter, Neptune, Uranus b. Mercury, Venus, Mars, Earth c. Earth, Venus, Mars, Jupiter d. Jupiter, Saturn, Uranus, Neptune 3. What makes the planet Earth habitable compared to other planets? a. It has soil. c. It has people. b. It has trees. d. It has liquid water. 4. Why is Earth called a terrestrial planet? a. It has life. c. It is farther from the sun. b. It is closest to the sury. d. His placed at almost the middle planets. 5. Which is supported and sustained by planet? a. Life c. a rocky core b. A moon d. an atmosphere 6. How many percent of water comprises the Earth? a. 15% 50% b. 30% d. 70% 7. What does Earth offers to human in order to sustain life? a. Earth has abundant plant. b. Earth has sufficient nutrients from ocean to land. C. Only A d. Both A and B. 8. Which of the following is NOT one of the four subsystem of the Earth? a. Biosphere c. water sphere b. Hydrosphere d.geosphere 9. What subsystem will network with biosphere for photosynthesis to take place? a. atmosphere c. hydrosphere b. geosphere d.biosphere up the 10. Which term is used to describe the thin layer of solid rock that makes outermost part of the Earth? a. Core c. mantle b. Crust d.biosphere 11. Among the subsystems, which is composed of a mixture of gases that surrounds the Earth? a. Nitrogen c.biosphere​