Which change does NOT tend to increase the driving forces affecting slope stability?
a. removal of lateral support
b. construction of a landfill near the top of the slope
c. ground shaking caused by an earthquake
d. placement of rock fill at the base of the slope
d
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The location of Washington, D.C. as the U.S. capital was made possible by a compromise between northern and southern states in 1790. What decision was analogous in Australia?
A. Melbourne and Sydney were competing to be the the national capital, so they built the new capital, Canberra, halfway between the two. B. Since Australia's population is evenly split between southeast and southwest coasts, Adelaide on the south coast was made the capital. C. White Australia's wanted an English name for the capital, but aborigines wanted an indigenous name, so the compromise was Canberra, which means "meeting place." D. Canberra's layout was designed by Chicago architects Walter Burly Griffin and Marion Mahony Griffin.
The concept of plate tectonics regards the Earth's ________ as broken into a number of ________ that are in motion relative to each other.
A. crust; plates B. mantle; plates C. asthenosphere; plates D. plates; lithosphere E. lithosphere; plates
A ________ is a geographic low, which marks the location where oceanic lithosphere descends into the mantle
A) fold and thrust mountain B) deep-ocean trench C) seismic zone D) mid-ocean rift
In the last few years improvements in technology have allowed geologists to date single grains of some minerals in rocks
A geologist separates 5 grains of the mineral zircon, which can be dated by the Uranium-lead method, and the crystal retains parent and daughter through weathering, erosion, and deposition. Thus, dating each mineral grain only gives the age of the source rock that was eroded, to produce that sand, from which the zircon grain is derived. The 5 grains yield ages of 160, 110, 2020, 66, and 162 million years. What do these ages tell you about the age of the sedimentary strata? A) They are between 160 and 162 million years. B) They are younger than 66 million years. C) They are Precambrian rocks, older than 2020 million years. D) There are no age constraints from this data; sedimentary rocks cannot be dated by geochronology.