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Water molecules were surely part of the dusty swirl that coalesced into the Sun and its planets beginning about nine billion years after the Big Bang. But Earth's early history, including epochs with high ambient temperatures and no enveloping atmosphere, implies that surface water would have evaporated and drifted back into space. The water we encounter today, it seems, must have been delivered long after Earth formed. Faced with this conundrum, astronomers realized that there are two ready-made sources: comets and asteroids, the solar system 's gravel strewn among planetary boulders. The primary difference between the two is that comets typically have a greater concentration of ingredients that vaporize when heated, accounting for their iconic gaseous tails. Both comets and asteroids can contain ice. And if, by colliding with Earth, they added the amount of material some scientists suspect, such bodies could easily have delivered oceans' worth of water. Accordingly, each has been fingered as a suspect in the mystery.

Water molecules were surely part of the dusty swirl that coalesced into the Sun and its planets beginning about nine billion years after the Big Bang. But Earth's early history, including epochs with high ambient temperatures and no enveloping atmosphere, implies that surface water would have evaporated and drifted back into space. The water we encounter today, it seems, must have been delivered long after Earth formed. Faced with this conundrum, astronomers realized that there are two ready-made sources: comets and asteroids, the solar system 's gravel strewn among planetary boulders. The primary difference between the two is that comets typically have a greater concentration of ingredients that vaporize when heated, accounting for their iconic gaseous tails. Both comets and asteroids can contain ice. And if, by colliding with Earth, they added the amount of material some scientists suspect, such bodies could easily have delivered oceans' worth of water. Accordingly, each has been fingered as a suspect in the mystery.

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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K Andrea Ortiz - Physical Educatio X K Andrea Ortiz - CA English 9A Tie x e Science) Credit 1 x K Andrea Ortiz- CA Biology A Cred x i web.kamihq.com/web/viewer.html?state=%7B*ids"%3A%5B"11yaeuPNI2yHX4sK5fSJdFFxwekqScJtV"%5D%2C*from"%3A"classroomop.. В У 100% Edu I A LE-Maybees Andrea Ortiz - CA Biology A Credit 1 FF.pdf CA Rev. 12/4/19 Water molecules were surely part of the dusty swirl that coalesced into the Sun and its planets beginning about nine billion years after the Big Bang. But Earth's early history, including epochs with high ambient temperatures and no enveloping atmosphere, implies that surface water would have evaporated and drifted back into space. The water we encounter today, it seems, must have been delivered long after Earth formed. Faced with this conundrum, astronomers realized that there are two ready-made sources: comets and asteroids, the solar system 's gravel strewn among planetary boulders. The primary difference between the two is that comets typically have a greater concentration of ingredients that vaporize when heated, accounting for their iconic gaseous tails. Both comets and asteroids can contain ice. And if, by colliding with Earth, they added the amount of material some scientists suspect, such bodies could easily have delivered oceans' worth of water. Accordingly, each has been fingered as a suspect in the mystery. Greene, Brian. "How Did Water Come to Earth?" Smithsonian.com. Smithsonian Magazine, May 2013. Web. 25 Feb. 2015. 3. According to the second article, where did Earth's water come from? 4. What evidence does this article give to support the author's claim? 5. After reading both articles, where do you think Earth's water came from? Use evidence from the articles to support your reasoning.
Transcribed Image Text:K Andrea Ortiz - Physical Educatio X K Andrea Ortiz - CA English 9A Tie x e Science) Credit 1 x K Andrea Ortiz- CA Biology A Cred x i web.kamihq.com/web/viewer.html?state=%7B*ids"%3A%5B"11yaeuPNI2yHX4sK5fSJdFFxwekqScJtV"%5D%2C*from"%3A"classroomop.. В У 100% Edu I A LE-Maybees Andrea Ortiz - CA Biology A Credit 1 FF.pdf CA Rev. 12/4/19 Water molecules were surely part of the dusty swirl that coalesced into the Sun and its planets beginning about nine billion years after the Big Bang. But Earth's early history, including epochs with high ambient temperatures and no enveloping atmosphere, implies that surface water would have evaporated and drifted back into space. The water we encounter today, it seems, must have been delivered long after Earth formed. Faced with this conundrum, astronomers realized that there are two ready-made sources: comets and asteroids, the solar system 's gravel strewn among planetary boulders. The primary difference between the two is that comets typically have a greater concentration of ingredients that vaporize when heated, accounting for their iconic gaseous tails. Both comets and asteroids can contain ice. And if, by colliding with Earth, they added the amount of material some scientists suspect, such bodies could easily have delivered oceans' worth of water. Accordingly, each has been fingered as a suspect in the mystery. Greene, Brian. "How Did Water Come to Earth?" Smithsonian.com. Smithsonian Magazine, May 2013. Web. 25 Feb. 2015. 3. According to the second article, where did Earth's water come from? 4. What evidence does this article give to support the author's claim? 5. After reading both articles, where do you think Earth's water came from? Use evidence from the articles to support your reasoning.
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