Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

Earth’s largest carbon reservoir is _______.

  1. a. the atmosphere
  2. b. sediments and rocks
  3. c. seawater
  4. d. living organisms

Summary Introduction

Concept introduction: Carbon is the most abundant substance in living things. In the carbon cycle, carbon circulates among Earth’s atmosphere, oceans, rocks, and soils, and in and out of food webs.


Reasons for the correct statement:

Option b. is given as “sediments and rocks”. In Marine carbon cycle, marine sediments and the sedimentary rocks are Earth’s largest carbon reservoir by far, holding more amount of carbon that is most probably 65 million gigatons. Limestone and other sedimentary rocks form when the calcium carbonate-rich shells of marine organisms become compacted over millions of years.

Mostly Earth’s carbon reservoirs are sediments and, rocks present in marine carbon cycle. Option b. is correct.

Reasons for the incorrect statements:

Option a. is given as “the atmosphere”. The atmosphere holds about 760 gigatons of carbon mostly in form of carbon dioxide...

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