Conservation tillage methods ________ than conventional tillage.
A. experience less topsoil loss
B. use more fuel
C. require more plowing
D. require more time
Answer: A
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Using the data in Figure 43-2, calculate the recurrence interval for Cache Creekâs streamflow for the years 1990, 1997, 2003, and 2013. Once you have calculated the recurrence intervals, fill in your answers below and in Figure 43-2 (round your answers to 1 decimal place).
1990: ______ years 1997: ______ years 2003: ______ years 2013: ______ years
How much of the ocean's primary productivity is generated by seaweeds?
a. Between 1% and 5% b. Between 5% and 10% c. Between 10% and 12%
d. Between 12% and 15% e. Less than 1%
The thinning of the ozone layer over the Antarctic always occurs at the end of the Antarctic winter because
A. ozone is consumed by melting ice as winter transitions to summer. B. the Antarctic experiences its highest level of radiation during its winter. C. during their winter, residents of the southern hemisphere use more CFCs. D. UV from the sun is necessary to the creation of ozone from oxygen and the Antarctic receives no UV from the sun during its winter.
When a large number of tornadoes develop in association with a particular weather system (typically six tornadoes or more), it is referred to as a ____
a. megacyclone b. mesocyclone c. tornado family d. tornado epidemic e. tornado outbreak