The Mesozoic Era began approximately ________ years ago.
A. 531 million
B. 252 million
C. 2.6 million
D. 65 million
E. 4.55 billion
Answer: B
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The left to right slope of the small island on the lower right of this photograph tells us that
A) a nearby stream on the mainland must be providing sediment to support the island.
B) wave action must be minimal in this area.
C) an area of coastal upwelling must be nearby.
D) the ocean depth must be increasing to the right.
The periods between glaciations are separated by warmer ____ stages
a. endothermic b. intercyclic c. interglacial d. thermostatic e. intermontaine
The amount CO2 that entered the atmosphere during the Paleocene-Eocene Thermal Maximum (PETM) is estimated to be the equivalent of
A) the amount released to the atmosphere by the 1991 Mount Pinatubo eruption. B) the amount human activity would release to the atmosphere with the burning of all Earth's fossil-fuel reserves. C) burning all of Earth's fossil fuel supply repeatedly 100 times over a 50 year period. D) the amount released to the atmosphere due to agricultural practices and rapid human population growth in China since 1980. E) the amount released to the atmosphere since the beginning of the industrial revolution.
When coal is burned to generate electricity, 70% of the primary energy in the coal is transformed into unused heat. This means that the energy conversion efficiency from chemical to electrical energy is ________
A) 70% B) 100% C) 30% D) 0% E) cannot be determined