The Atmosphere of Venus Is Observed to Contain Almost No

question 5

Multiple Choice

The atmosphere of Venus is observed to contain almost no water.This is apparent because

• A) the water is locked up as ice (permafrost)beneath the surface of the planet.
• B) Venus is so hot that whatever water there was simply evaporated into space because it was lighter than the major constituent,carbon dioxide.
• C) solar UV light dissociated the water into hydrogen and oxygen;the hydrogen then escaped into space and the oxygen combined with other substances.
• D) Venus has never had a significant amount of water,having formed closer to the Sun than did Earth,where water in the solar nebula could not condense.

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Definitions:

Vocal Cords

Bands of muscle tissue located in the larynx that vibrate to produce sound when air is expelled from the lungs, enabling speech and singing.

Epithelium

A membranous tissue covering internal organs and other internal surfaces of the body, involved in protection, secretion, and absorption.

Bronchus

Airway connecting the trachea to a lung.

Alveoli

Small pulmonary vesicles where oxygen and carbon dioxide are exchanged in the respiratory process.