The modern climate interval, which is characterized by stable, warm temperatures compared to most of the last 2.6 million years, is known as the:
a. Altithermal.
b. Little Warm Age.
c. Holocene.
d. Pleistocene.
C
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Although we don't know for sure, changes in the strength and orientation of earth's magnetic field are most likely due to
A) fluctuations in outer-core convection. B) variations in sea-floor spreading rates. C) the total number of mantle hot spots. D) changes in the velocity of subducting plates.
Nationwide in the United States, particulates come mostly from ________, but in urban areas they are derived from vehicles and industrial sources
A) soil erosion B) smoke from burning forests C) coal-fired power plants D) roads and construction sites E) non-U.S. sources
________ soils commonly consist entirely of O and A horizons
A) Forest B) Rainforest C) Grassland D) Desert E) Wetland
Tornadoes, although erratic in their pathways, are always characterized by ________ pressure
A) high B) low C) constantly variable D) adiabatic E) devaporized