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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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
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.