ENVS 101 - Chapter 2 - Environmental Systems:
Matter, Energy and Ecosystems Questions with
Correct Answers
Watershed Correct Answer-The entire area of land from which water
drains into a given river.
Hypoxia Correct Answer-The condition of extremely low dissolved
oxygen concentrations in a body of water.
System Correct Answer-A network of relationships among a group of
parts, elements, or components that interact with and influence one
another through the exchange of energy, matter, and-or information.
Lithosphere Correct Answer-The outer layer of Earth, consisting of crust
and uppermost mantle and located just above the asthenosphere. More
generally, the solid part of Earth, many miles underground.
Atmosphere Correct Answer-The thing layer of gases surrounding planet
Earth.
Hydrosphere Correct Answer-All water - salt or fresh, liquid, or ice or
vapor - in surface bodies, underground and in the atmosphere.
Biosphere Correct Answer-The total sum of all the plant's living
organisms ad the abiotic portions of the environment with which they
interact.
, Feedback Loop Correct Answer-A circular process in which a system's
output serves as input to that same system.
Negative Feedback Loop Correct Answer-A feedback loop in which
output of one type acts as input that moves the system in the opposite
direction. The input and output essentially neutralize each other's effects,
stabilizing the system.
Positive Feedback Loop Correct Answer-A feedback loop in which
output of one type acts as input that moves the system in the same
direction. The input and output drive the system further toward one
extreme or another.
Dynamic Equilibrium Correct Answer-The state reached when processes
within a system are moving in opposite directions at equivalent rates so
that their effects balance out.
Homeostasis Correct Answer-The tendency of a system to maintain
constant or stable internal conditions.
Runoff Correct Answer-The water from precipitation that flows into
streams, rivers, lakes and ponds, and in many cases, eventually in to the
ocean.
Airshed Correct Answer-The geographic area that produces air
pollutants likely to end up in a waterway.
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