Shifting cultivation is being replaced by
A) logging.
B) cattle ranching.
C) cultivation of cash crops (commercial agriculture).
D) All of these are replacing shifting cultivation.
Answer: D
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In igneous rocks with porphyritic texture, the larger minerals are phenocrysts, and the smaller minerals
collectively make up the groundmass. Indicate whether the statement is true or false.
How do autotrophs differ from heterotrophs and how does it relate to the trophic pyramid?
Explain the rock cycle. Include information on how the three major categories of rocks differ from each other
The half-life of carbon-14 is about 6000 years. Assume that a sample of charcoal formed by burning of living wood 15,000 years ago. How much of the original carbon-14 would remain today?
A) between one-fourth and one-eighth B) between one-half and one-fourth C) more than one-half D) between one-half and one-third