Earth & Meteorites form
  • 1. The formation of Earth and meteorites is a fascinating story that spans billions of years, rooted in the early days of the Solar System. Approximately 4.6 billion years ago, a giant rotating disk of gas and dust, known as the solar nebula, began to collapse under the force of gravity, leading to the creation of the Sun at its center. As the nebula cooled, solid particles began to stick together, forming larger and larger bodies through a process known as accretion. In regions where the temperature was just right, these particles coalesced to form planetesimals – the building blocks of planets. Among these, Earth emerged as one of the terrestrial planets, characterized by its rocky composition and ability to support life. As Earth continued to grow, it experienced numerous collisions with other planetesimals, including protoplanets and smaller bodies that eventually became meteorites. These meteorites, often remnants from the early Solar System, provide crucial insights into the materials and conditions present at the time of Earth's formation. They serve as time capsules, preserving information about the primordial matter that formed not only Earth but also the other planets in our solar neighborhood. The ongoing study of meteorites continues to unlock the secrets of our cosmic origins and the processes that shaped our home planet, highlighting the intricate connections between Earth and the myriad celestial bodies that drift through space.

    Which of the following is a terrestrial planet?
A) Uranus
B) Saturn
C) Jupiter
D) Earth
  • 2. Which layer of the Earth's interior is primarily composed of nickel and iron?
A) Mantle
B) Core
C) Outer core
D) Crust
  • 3. What is the name of the layer above the Earth's outer core?
A) Mantle
B) Asthenosphere
C) Crust
D) Outer core
  • 4. What is the process by which a metamorphic rock turns into magma?
A) Erosion
B) Weathering
C) Melting
D) Compaction
  • 5. What is the outermost layer of the Earth called?
A) Lithosphere
B) Core
C) Mantle
D) Crust
  • 6. What type of rock is formed from the cooling and solidification of magma or lava?
A) Sedimentary
B) Metamorphic
C) Igneous
D) Volcanic
  • 7. What is the name for a meteorite that contains small spherical particles called chondrules?
A) Chondrite
B) Achondrite
C) Iron meteorite
D) Stony-iron meteorite
  • 8. What is the name given to a rock that falls to the Earth’s surface from space?
A) Meteoroid
B) Asteroid
C) Comet
D) Meteorite
  • 9. What is the name for a meteorite that does not contain chondrules?
A) Iron meteorite
B) Chondrite
C) Carbonaceous chondrite
D) Achondrite
  • 10. Which element is commonly found in iron meteorites?
A) Gold
B) Silicon
C) Oxygen
D) Nickel
  • 11. What is the study of meteorites and impact craters called?
A) Seismology
B) Meteoritics
C) Planetary science
D) Astrogeology
  • 12. What process results in the formation of new oceanic crust at mid-ocean ridges?
A) Seafloor spreading
B) Rifting
C) Continental drift
D) Subduction
  • 13. What is the name of the belt of asteroids located between the orbits of Mars and Jupiter?
A) Kuiper Belt
B) Asteroid belt
C) Oort Cloud
D) Main Belt
  • 14. Which planet is known for its prominent rings composed of ice and rock particles?
A) Saturn
B) Neptune
C) Jupiter
D) Uranus
  • 15. What is the process of Earth's formation called?
A) Sublimation
B) Accretion
C) Erosion
D) Combustion
  • 16. Where is the K-T boundary located?
A) On the Moon
B) Between Cretaceous and Tertiary periods
C) In the Amazon Rainforest
D) Under the ocean
  • 17. What is the solid layer beneath the Earth's lithosphere called?
A) Outer core
B) Asthenosphere
C) Inner core
D) Mantle
  • 18. What is the name for the process by which one tectonic plate moves beneath another?
A) Divergence
B) Erosion
C) Convection
D) Subduction
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