6. Which of the following best describes the surface of the planet Earth?, A. a thick layer of hydrogen gas, B. cloudy and hot with lots of volcano, C. cold, rocky, and covered with red dust, D. mostly water surface with some areas of land, 7. Earth is said to be a unique planet. Which answer verifies the statement?, A. It supports Life,, B. It is mostly covered in water., C. Its atmosphere is mostly nitrogen and oxygen., D. All of the above, 8. Which is supported and sustained by planet?, A life, C. a rocky core, B. a moon, D. an atmosphere, 9. How many percent of water comprises the Earth?, A 15%, C. 50%, B. 30%, D. 70%, 10. Which factors are needed for organisms to live on Earth?, A. temperature and nutrient C. only A, B, atmosphere and energy, D. both A and B, “11. What characteristics does the Earth have to maintain an organisms body to”, 12, survive?, A. Earth has a water cycle and atmosphere, B. Earth has volcanic activities to circulate nutrients., C. Earth has sub-surface water or molten rock that can circulate and, replenish nutrients for organisms,, D. All of the above, What makes Earth similar to Venus?, A. Earth and Venus are the right sizes to hold a sufficient atmosphere., “B. Venusatmosphere is 100 times thicker than Earth.”, C. Among all the solid planets and moons, only Earth, Venus, and Titan, have significant atmospheres., D. Both A and C, 13. Which statement about the Earth will help organisms to survive?, A Earth has no protective equipment like ozone., B. Earth has layer water only for favorable climate., C. Earth has man-made natural cycles, “D. Earths temperature is neither the hottest nor the coldest among other”, planets., 14. Which distinct characteristic made Earth different from any other planet?, A. It is the only rocky planet., B. It is the only planet that turns around in space., C. It is the only planet that has a large amount of liquid water., D. It is the only planet that changes its structure, 15. What does Earth offers to human in order to sustain life?, A. Earth has abundant plant life., B. Earth has sufficient nutrients from ocean to land., C. Only A, D. Both A and B.