An argillic soil horizon is enriched in clay moved from the A horizon
Indicate whether the statement is true or false
TRUE
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What is a rem?
A. Rem stands for Rapid Electron Motion. B. Rem is an '80s rock group. C. A rem is the maximum exposure limit for occupational safety. D. A rem is a unit for measuring radiation exposure. E. A rem is the number of radiation particles absorbed per second.
The high levels of atmospheric nitrogen are due primarily to the fact that:
A) the earth is constantly bombarded by small, house-sized comets. B) nitrogen has a very long residence time. C) nitrogen is the major component of the gas emitted from volcanoes. D) nitrogen is produced by many species of bacteria.
Flexible buildings (made of wood or steel) have a ________ resonant period than a stiffer building (one of brick or concrete).
A. period does not depend on building stiffness B. longer C. shorter
Most of the people on Singapore are:
A) ethnic Chinese B) of Portuguese ancestry C) Muslim D) Malayan E) none of these