Which two processes form most sinkholes?
a. solution and collapse
b. carbonation and oxidation
c. freeze-thaw and mass wasting
d. acid mine drainage and evaporation
e. hydration and hydrolysis
a
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An increase in total forest mass should lead to a decrease in either the amount of carbon dioxide in the atmosphere and/or the rate at which the concentration of carbon dioxide in the atmosphere is growing
Indicate whether the statement is true or false.
During the Pleistocene of North America, there were at least ____________________ glacial stages
These stages, in order from oldest to youngest, are the ____________________, ____________________, ____________________, and ____________________. What will be an ideal response?
Which of the following best describes tornado development?
A) Evaporation over warm ocean waters leads to convective thunderstorms; as laten energy is released as the water vapor condenses, tornadic activity is spawned. B) A horizontally rotating body of air is tipped vertically by an updraft with a cumulonimbus cloud, forming a mesocyclone, which can generate tornado activity. C) Strong downdrafts in a cumulonimbus cloud cause the formation of funnel clouds, which pulse from the bottom sometimes forming tornadoes. D) Orographic uplift near warm ocean currents forces warm, moist air to rise and cool to dew point. The latent heat associated with condensation leads to strong downdrafts and tornado formation. E) Bands of rapidly moving thunderstorms create powerful, straightline winds.
The 1-cm-thick clay layer that marks the Cretaceous/Tertiary (K/T) boundary has a high percentage of the element ________ in the clay layer, an enrichment about 300 times greater than the normal abundance.
A. iron B. zircon C. silicon D. iridium E. oxygen