Explain two ways in which human activity increases the danger of drought and desertification
What will be an ideal response?
ANSWER: ?
A successful answer will include two of the following:
- damming of rivers or increased use of water upstream reduces soil moisture downstream.
- overgrazing by livestock or wildlife, concentrated in an area by fencing or artificial water sources, breaks up soil, compacts deeper soil, and reduces water infiltration.
- cultivation decreases soil moisture by exposing more soil to heat and air.
- topsoil disturbed by cultivation can dry and blow away, exposing deeper soils to evaporative processes.
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What goal did the Treaty of Tordesillas accomplish?
A) gave possession of Puerto Rico to the United States B) ended the Spanish-American War C) ended the Mexican revolution of 1910 D) divided South America between Spain and Portugal E) established the North American Free Trade Agreement (NAFTA)
The root-shaped jumble at the base of a seaweed is called a(n) ____
A) ?holdfast B) ?blade C) ?stamen D) ?aerenchyma
Go to a local market that sells seafood. Determine how much of the fish being sold originated in another country
What will be an ideal response?
Which of the following is correct of floodplains?
A) They rarely occur in a fluvial landscape created by an "old" river. B) They are erosional landforms. C) They often evolve after a stream has ceased downcutting at a significant rate. D) They are the areas of a stream where terraces are present.