Evolution of the Earth

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Questions and Answers

What is the process of release of gases from the interior of the earth called?

  • Degassing (correct)
  • Condensation
  • Volcanism
  • Sublimation

Which layer of the Earth is the heaviest elements like iron moved towards?

  • Crust
  • Inner core (correct)
  • Outer core
  • Mantle

What are the main components of the early atmosphere mentioned in the text?

  • Carbon dioxide, nitrogen, oxygen
  • Methane, ammonia, oxygen
  • Water vapour, carbon dioxide, nitrogen (correct)
  • Oxygen, hydrogen, helium

What provided the atmosphere with water vapour and gases according to the text?

<p>Volcanic eruptions (A)</p> Signup and view all the answers

What was the earth's atmosphere mainly composed of during its early stage?

<p>Carbon dioxide and methane (D)</p> Signup and view all the answers

What process brought rain to the cooling earth according to the text?

<p>Condensation (B)</p> Signup and view all the answers

What process led to the oceans getting saturated with oxygen?

<p>Photosynthesis (A)</p> Signup and view all the answers

During which geological time period did life move from being limited to oceans to appearing on land?

<p>Paleozoic (B)</p> Signup and view all the answers

What primarily caused the lowering of temperature leading to more condensation and rain?

<p>Dissolution of carbon dioxide in rainwater (C)</p> Signup and view all the answers

During which period did extinctions of dinosaurs occur?

<p>Cretaceous (B)</p> Signup and view all the answers

What marked the transition from life being limited to oceans to spreading onto land?

<p>Emergence and diversification of land-dwelling organisms (C)</p> Signup and view all the answers

During which era did early human ancestors exist?

<p>Cainozoic (A)</p> Signup and view all the answers

What caused the heavier elements like iron to move towards the center of the Earth?

<p>Increasing temperature (D)</p> Signup and view all the answers

What was the early atmosphere of the Earth mainly composed of?

<p>Carbon dioxide and ammonia (B)</p> Signup and view all the answers

What process started the evolution of the present atmosphere by causing the release of gases from the interior of the Earth?

<p>Degassing (C)</p> Signup and view all the answers

Which layer of the Earth is formed by the materials getting separated according to their densities?

<p>Crust (A)</p> Signup and view all the answers

What led to the condensation of water vapour and brought rain to the cooling Earth?

<p>Frequent volcanic eruptions (A)</p> Signup and view all the answers

What was the Earth's atmosphere mostly lacking during its early stage?

<p>Free oxygen (D)</p> Signup and view all the answers

What marked the transition from life being limited to oceans to spreading onto land?

<p>Appearance of flowering plants and trees (A)</p> Signup and view all the answers

During which geological time period did life move from being limited to oceans to appearing on land?

<p>Paleozoic (B)</p> Signup and view all the answers

What process led to the oceans getting saturated with oxygen?

<p>Photosynthesis (B)</p> Signup and view all the answers

What primarily caused the lowering of temperature leading to more condensation and rain?

<p>Dissolution of carbon dioxide in rainwater (C)</p> Signup and view all the answers

During which era did early human ancestors exist?

<p>Cainozoic (D)</p> Signup and view all the answers

What are the main components of the early atmosphere mentioned in the text?

<p>Carbon dioxide and water vapor (C)</p> Signup and view all the answers

What is the process of release of gases from the interior of the earth called?

<p>Outgassing (D)</p> Signup and view all the answers

During which period did extinctions of dinosaurs occur?

<p>Cretaceous (A)</p> Signup and view all the answers

What provided the atmosphere with water vapor and gases according to the text?

<p>Dissolution of carbon dioxide in rainwater (D)</p> Signup and view all the answers

What was the earth's atmosphere mainly composed of during its early stage?

<p>Carbon dioxide and water vapor (C)</p> Signup and view all the answers

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Study Notes

Formation of the Earth

  • The process of release of gases from the interior of the Earth is called volcanic outgassing.
  • The heavier elements like iron moved towards the center of the Earth through a process called differentiation.

Early Atmosphere

  • The main components of the early atmosphere mentioned in the text are water vapor and gases.
  • Volcanic outgassing provided the atmosphere with water vapor and gases.
  • The early atmosphere was mainly composed of water vapor and gases.

Cooling of the Earth

  • The cooling of the Earth led to condensation and rain through a process called precipitation.
  • The lowering of temperature primarily caused the condensation of water vapor and brought rain to the cooling Earth.

Evolution of Life

  • The transition from life being limited to oceans to spreading onto land marked the Silurian period.
  • During the Silurian period, life moved from being limited to oceans to appearing on land.
  • Oxygenation of the oceans led to the oceans getting saturated with oxygen.

Geological Time Periods

  • Dinosaurs became extinct during the Cretaceous period.
  • Early human ancestors existed during the Paleolithic era.

Formation of the Layers of the Earth

  • The Earth's layers formed through differentiation, where materials separated according to their densities.

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