IB Biology Topic A1.1.7: Extraplanetary Origin of Water on Earth and Reasons for Its Retention Notes

Early Earth Was Too Hot for Water

During Earth's formation, temperatures were extremely high.

Any water present would have evaporated and been lost to space.

Therefore, water had to come from an extraplanetary source, beyond Earth itself.

Tip

Earth holds approximately 1.4 billion cubic kilometers of water, with 98.3% in a liquid state.
The rest exists as solid ice, snow, or water vapor in the atmosphere.

Asteroids Delivered Earth's Water

The most widely accepted explanation is that water was delivered by asteroid collisions.

During Earth's early history, there was a period of intense asteroid bombardment.

Many of these asteroids contained water (as ice or hydrated minerals).

When asteroids collided with Earth, they delivered water to the planet's surface.

Evidence:

Traces of water have been found in material from asteroids.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

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Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
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IB Biology Topic A1.1.7: Extraplanetary Origin of Water on Earth and Reasons for Its Retention Notes

Early Earth Was Too Hot for Water

Asteroids Delivered Earth's Water

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Early Earth Was Too Hot for Water

Asteroids Delivered Earth's Water

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic A1.1.7: Extraplanetary Origin of Water on Earth and Reasons for Its Retention Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Early Earth Was Too Hot for Water

Asteroids Delivered Earth's Water

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Early Earth Was Too Hot for Water

Asteroids Delivered Earth's Water

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account