- 1. Earth is the third planet from the Sun and the only astronomical object known to harbor life. With a diameter of about 12,742 kilometers, it is the largest of the terrestrial planets in the Solar System and is characterized by a diverse array of ecosystems, landscapes, and environments ranging from vast oceans and towering mountain ranges to arid deserts and lush rainforests. Approximately 71% of its surface is covered by water, primarily in the form of saltwater oceans, which play a pivotal role in Earth's climate and weather systems. The atmosphere, composed predominantly of nitrogen (78%) and oxygen (21%), protects life forms by filtering harmful solar radiation and providing essential gases for respiration. Earth is also unique in its geologic activity; it possesses tectonic plates that shift and collide, leading to phenomena such as earthquakes and volcanic eruptions. This dynamic planet fosters a rich tapestry of biodiversity, showcasing millions of species adapted to its varied environments. Human civilization, with its advanced technology and profound impact on the planet, occupies a significant niche, yet faces challenges such as climate change, pollution, and loss of biodiversity. Earth, a beautiful blue planet suspended in the vastness of space, remains a precious home and a subject of wonder and exploration for humanity.
What is the outermost layer of Earth called?
A) Crust
B) Outer core
C) Mantle
D) Inner core
- 2. Which planet is closest to Earth?
A) Saturn
B) Mars
C) Venus
D) Jupiter
- 3. What percentage of Earth's surface is covered by water?
A) 71%
B) 50%
C) 33%
D) 85%
- 4. Which layer of the atmosphere contains the ozone layer?
A) Mesosphere
B) Troposphere
C) Stratosphere
D) Thermosphere
- 5. What is the highest mountain on Earth?
A) Lhotse
B) Makalu
C) K2
D) Mount Everest
- 6. Which gas makes up the majority of Earth's atmosphere?
A) Oxygen
B) Argon
C) Carbon dioxide
D) Nitrogen
- 7. What is the process by which plants convert sunlight into energy?
A) Fermentation
B) Evaporation
C) Respiration
D) Photosynthesis
- 8. What is the largest ocean on Earth?
A) Atlantic Ocean
B) Indian Ocean
C) Pacific Ocean
D) Southern Ocean
- 9. Who proposed the theory of continental drift in the early 20th century?
A) Charles Darwin
B) Marie Curie
C) Isaac Newton
D) Alfred Wegener
- 10. What is the Earth's primary source of energy?
A) Geothermal energy
B) Fossil fuels
C) Wind energy
D) The Sun
- 11. What is the scientific study of Earth called?
A) Ecology
B) Geology
C) Astronomy
D) Meteorology
- 12. Which layer of Earth's atmosphere is closest to the planet's surface?
A) Troposphere
B) Stratosphere
C) Thermosphere
D) Mesosphere
- 13. What are the four inner rocky planets in our solar system?
A) Jupiter, Saturn, Uranus, Neptune
B) Earth, Mars, Jupiter, Saturn
C) Sun, Mercury, Venus, Earth
D) Mercury, Venus, Earth, Mars
- 14. Approximately how long does it take for the Earth to complete one full rotation on its axis?
A) 48 hours
B) 36 hours
C) 24 hours
D) 12 hours
- 15. Which is the largest desert in the world?
A) Antarctica
B) Arabian Desert
C) Gobi Desert
D) Sahara Desert
- 16. What is the imaginary line that divides the Earth into the Northern and Southern Hemispheres called?
A) Prime Meridian
B) Tropic of Capricorn
C) Equator
D) Tropic of Cancer
- 17. Which phenomenon causes the appearance of colors in the sky during sunrise and sunset?
A) Rainbow refraction
B) Greenhouse effect
C) Rayleigh scattering
D) Aurora borealis
- 18. What is the most abundant element in the Earth's crust?
A) Oxygen
B) Aluminum
C) Silicon
D) Carbon
- 19. Which natural satellite orbits the Earth?
A) Moon
B) Titan
C) Ganymede
D) Europa
- 20. Which geological era saw the rise of dinosaurs?
A) Cenozoic Era
B) Mesozoic Era
C) Paleozoic Era
D) Precambrian Era
- 21. Which force holds the Earth in its orbit around the Sun?
A) Friction
B) Centrifugal force
C) Gravity
D) Magnetism
- 22. What is the name of the massive supercontinent that existed before Pangaea?
A) Laurasia
B) Pannotia
C) Gondwana
D) Rodinia
|