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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Transcribed Image Text:on
k.
7.2 Natural carbon recycling
ADVANCED
STANDARD
Science understanding
FOUNDATION
bushfire (n) a forest
fire that is out of
contral
Carbon is the basis of all life on Earth. There is a fixed amount of
carbon on Earth and this carbon is continuously recycled and reuscu.
It takes carbon about 100 million vears to complete one cycle through
the lithosphere (rock, soil, land), bydrosphere (oceans, lakes, rivers), the
atmosphere and the biosphere.
controlled burn In) a
supervised fire
Carbon stores
HINT
The Earth's four major carbon stores (or sinks) are-the atmosphere,
occans, terrestrial ecosystems (on land) and Earth's crust.
1 Gigatonne =
10 tonne = 10" kg
Table 7.2.1 Earth's principal carbon stores in gigatonnes (Gt)
Stores of carbon
Gigatonnes (Gt)
Gigatonnes (Gt)
Stores of carbon
marine sediments and
3000
sedimentary rocks
66000 000-100 000 000
coal
deep oceans
soils and organic matter
1600
40 000
surface oceans
1000
oil and gas
300
vegetation
540-610
the atmosphere
750
Plants and the carbon cycle
Plants absorb carbon dioxide from the atmosphere through photosynthesis. Some carbon is
returned to the atmosphere almost immediately through respiration. The remainder is used to build
leaves, wood and roots, and may be stored for hundreds of years either as the tree itself or in wood
products made from it, such as the frames of houses or furniture.
Plant litter (fallen leaves and twigs) and roots become part of the soil when decomposer organisms
Plant
break them down. As the litter is broken down, carbon is released into the atmosphere.
Bushfires, controlled burns or using firewood to heat homes rapidly releases stored carbon into the
atmosphere. Most of the carbon will be in the form of carbon dioxide. There may also be carbon
monoxide and methane, depending on the conditions of burning. Following burning, carbon may
also be added to the soil in the form of charcoal, which remains stable for many years.
Name the Earth's four major stores of carbon. TelreTmal
atwosphere
1
ecoustenl
ust.
Oceans
Use the data about carbon stores in Table 7.2.1 and rewrite the carbon stores, ranking them
from the largest to the smallest storage.
Largest
Smallest
3
Which do you think is the most stable store? Explain,
4
Which store do you think changes most rapidly? Explain,
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Transcribed Image Text:7.3 The carbon cycle
Name the human activity that is responsible for the greatest change to the amount of carbon
available for cycling.
buming of fossil fuels such as
coal, oil anel gas.
O Explain how farming cattle to provide meat and milk may change the amount of carbon in
the atmosphere.
3
O Analyse the information provided about how human activity changes the carbon cycle. On
the diagram of the carbon cycle below:
4.
Tai colour in red the arrows that represent movements of carbon that would be increased by
human activity
(b) colour in blue the arrows that represent movements of carbon that would be reduced by
human activity
carbon dioxide
in air
burning of fossil fuels
for vehicles, electricity and heat
burning of forests
fuel wood and
organic debris
photosynthesis
carbon stored
in plant tissue
terestrial food chains
carbon stored
in animal tissue
respiration
decomposers
wasted, dead organisms ime
coal
photosynthesis
(aquatic food chaina)
oil and gas
time
organic sediments
formation ol
fossi tuels
time
calcareous
sediments
formatiohrot
limestone and
dolomite
(c) number each coloured arrow and explain the human activity involved and how the
activity would bring about change.
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PEARSON SCIENCE 10 2ND EDITION
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