The steepest natural angle that loose material can stand at without pieces sliding or rolling downslope is called the ____________________
Fill in the blank(s) with correct word
angle of repose
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A wave traveling 1 m in 1 s with a frequency of 1 Hz has an amplitude of
A. 1 m. B. more than 1 m. C. less than 1 m. D. not enough information
The difference between active and passive remote sensing systems is that
A) active systems involve the latest generation of satellites while passive systems use signals from older satellites. B) active systems include aerial photography while passive systems rely on satellite imagery. C) active systems can operate throughout cloud or fog cover while passive systems require clear sky conditions. D) active systems emit their own energy while passive systems simply detect existing energy signals.
Natural increase rate is the number of years needed to double a population, assuming a constant rate of natural increase
Indicate whether the statement is true or false.
What causes volcanic explosions?
A. Breaking of rocks during an earthquake B. Collisions between tectonic plates C. Escaping volcanic gases D. Increased melting due to high water content