Contrast "good" anthropogenic change with "bad" anthropogenic change by citing examples of each
What will be an ideal response?
Ruddiman has suggested that ancient humans staved off a glacial episode or at
least extended the interglacial by cultivating crops such as rice (which releases methane) and
felling trees to clear fields, which releases carbon dioxide.
Some would consider the warming of Earth due to human intervention a good thing. There
is less snow here in Ohio, and we use less gas to heat our house than we used to.
Unfavorable changes include sea level rise, habitat fragmentation, reduction of predators of
disease reservoir organisms, increased spread of infectious disease vectored by insects
whose range is increased, bleaching of corals, loss of biological diversity, changes in timing
of birds and their prey, and so on. The list could go on for quite a while, but it gives an idea
of the unfavorable changes.
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Which of the following strengthening processes in metals does not require the addition of foreign atoms or compounds to a pure metal?
(a) Grain boundary (b) Dispersion (c) Precipitation (d) Solid solution
In what way is the rocky material of Jupiter's core different from the rocks found on Earth?
a. It is much cooler because Jupiter is further from the Sun. b. It contains more liquid water. c. It is much hotter and denser because of the extreme pressure at the core of Jupiter. d. It is not composed of iron and nickel because this material will float of the surface. e. It is composed entirely of ices that have frozen into a large rock-like structure.
In the operation of a steam-electric generating plant, the work output [from thermal energy to work] occurs
A) at the point where the fossil or other fuel is shipped into the plant area. B) in the condenser. C) at the point where the energy from the furnace is transferred into the boiler. D) at the point where the hot steam pushes against the turbine. E) in the electric generators.
A 1.0-kg ball is attached to the end of a 2.5-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point in its swing when it is moving horizontally, the ball collides elastically with a 2.0-kg block initially at rest on a horizontal frictionless surface. What is the speed of the block just after the collision?
a. 2.3 m/s b. 4.7 m/s c. 3.5 m/s d. 3.0 m/s e. 7.0 m/s