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IB Biology HL A1.1.7 Hl Extraplanetary Origin of Water on Earth Questions

Practise IB Biology HL A1.1.7 by explaining how Earth’s early atmosphere and surface conditions allowed water to remain on the planet.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how early atmospheric conditions helped Earth retain surface water.

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Study A1.1.7 (HL)—Extraplanetary origin of water on Earth conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL A1.1.7 Hl Extraplanetary Origin of Water on Earth Questions question 1

[Maximum number: 1]

It has been hypothesized that asteroids were the primary source of Earth's water. What has caused the retention of water on Earth?

A

The gases of the early atmosphere absorbed water vapour.

B

High atmospheric pressure prevented water vapour from escaping.

C

Temperatures on Earth allowed condensation of water.

D

Water was trapped in the pores of newly formed rocks.

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