Drip irrigation is used on ____________________%of irrigated crop fields in the United States, and ____________________% of irrigated crop fields worldwide
Fill in the blanks with correct word
4, 1
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A volcano that erupts with frequent, moderate eruptions is more likely to increase biodiversity than is a volcano that erupts with major eruptions
Indicate whether the statement is true or false
A lahar is produced when
A) ash is blown out of a vent and onto the side of the volcano B) ash and other pyroclastic ejecta become saturated with water C) a lateral blast spreads ash across a large area D) a lava flow breaks apart on the steep portion of a composite cone
What is the smallest number of carbon atoms which can be found in an unsymmetrical ether that contains only C, H and a single O atom?
A) 1 B) 2 C) 3 D) 4
In which of the following areas would one likely find Mollisols?
A) Central Africa B) Sub-Saharan Africa C) U.S. Southeast D) U.S. Great Plains