Producing less on the same amount of land is called _________________.
Fill in the blank(s) with the appropriate word(s).
Extensification
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Mutations in sex cells can be induced by ultraviolet radiation or extreme temperatures. Indicate whether the statement is true or false
Which of the following statements regarding variations in Earth's orbit is true?
A. their combined effect on past global temperatures is purely hypothetical. B. even together, they don't produce enough temperature change to cause an ice age. C. they can fully account for the recent rise in global temperature. D. their effect on global temperatures was only recently discovered by NASA scientists. E. all of the answers listed here.
The tundra climate is bounded on its poleward side by the average annual ________°C (ºF) isotherm
A) 0 (32) B) 20 (68) C) -10 (14) D) -40 (-40) E) -50 (-58)
Which of the following statements is not true?
A. On worldwide average, the largest earthquakes, with Richter magnitudes over 8, occur only once every few years. B. There are many more small earthquakes than large ones and the small ones thus account for most of the seismic energy released by earthquakes each year. C. There is no predefined upper limit to the Richter scale. D. While great earthquakes are rare, there may be hundreds of thousands of small earthquakes each year.