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

Explain the asteroid delivery hypothesis for Earth’s water, the isotope evidence from carbonaceous chondrites and Vesta meteorites, and how gravity and cooler temperatures allowed water vapour to condense and be retained.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain the syllabus hypothesis that asteroids delivered water to Earth, using isotope similarities in carbonaceous chondrites and Vesta meteorites as evidence.
  • Explain how Earth’s gravity and cooler temperatures allowed water vapour to condense and be retained.

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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