Oceans - Chapter 2 Origins and Coral Health Quiz Review

Life on earth likely evolved

• on land

• in the ocean

• in an atmosphere rich in oxygen

• underground

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The Earth's ocean likely formed from

• outgassing of volcanic gases

• millions of years of asteroid bombardment

• millions of years of condensation and rain as the Earth cooled

• all of these

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Our sun and its family of planets formed about

• 100 years ago

• 5 billion years ago

• 5 million years ago

• 5 trillion years ago

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Biosynthesis is

• the evolution of simple life from organic building blocks

• the evolution of the ocean

• the discovery of organic compounds in space

• life evolved in an oxygen rich atmosphere

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Free oxygen in Earth's atmosphere was likely created by the process of

• photosynthesis

• cellular respiration

• methane synthesis

• outgassing

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As Earth cooled, its layers sorted themselves by

• density

• alphabetic order

• atomic number

• color

The earliest known fossils found resemble modern day

• bacteria

• dinosaurs

• mammals

• insects

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Another celestial body in our solar system that may have an ocean is

• Europa - a moon of Jupiter

• Mercury

• Venus

• Neptune

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A radioisotope found at the bottom of the Pacific Ocean has a half life of 150,000 years. If 300,000 years have passed, how much of the 12 g. original sample remains?

• 3 g

• 6 g

• 24 g

• 12 g

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Outgassing is the term used to describe

• the icy comets that bombarded Earth during it's early formation

• the volcanic venting of gases that played a role in the evolution of Earth's atmosphere

• the dissolved gas content of the ocean

• the ozone layer depletion and regeneration cycle