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MICRO 401 EXAM 1QUESTIONS AND VERIFIED ANSWERS

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Course MICRO 401
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MICRO 401 EXAM 1QUESTIONS AND VERIFIED ANSWERS

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MICRO 401 EXAM 1QUESTIONS AND VERIFIED
ANSWERS


Water in the ocean makes up more than ____ % of biosphere - Answers - 90% of
biosphere

Distribution of water in Northern hemisphere - Answers - 61% water

Distribution of water in Southern hemisphere - Answers - 81% water

Depths of 3000-6000 m predominate - Answers - COLD, DARK, HIGH PRESSURE

Land impacts ocean by: - Answers - freshwater, nutrients, dust, plants, animals,
microbes, other organic material

Ocean impacts land by: - Answers - Marine aerosol, tsunamis, other waves, guano
deposition

Seawater comprised mainly of: - Answers - Na+, Cl-

How much atmospheric gases enter the ocean? And what is mostly comprised of? -
Answers - 10^13 t/year of atmospheric gas; comprised mainly of O2 and CO2

What are biogenic substances? - Answers - non-carbon; but of biological origin [silica +
caco3]

What is the ph of the ocean? - Answers - varies between 7.5-8.4

Define residence time: - Answers - Amount of an element in the ocean divided by its
rate of removal or addition

Residence time of Cl - Answers - 100 million yrs

Residence time of Na - Answers - 68 million yrs

Why do Cl + Na have long residence times? - Answers - Major elements of salinity have
long residence times and mix well

What elements are important in biochemical processes but little or no effect on
seawater's physical properties? - Answers - phosphorus + iron

What are the sources of elements? - Answers - Local, Global, Hydrothermal vents

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