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
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
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
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