Many Asian farmers, particularly in the tropical rainforest regions, practice shifting agriculture. Describe the four stages in shifting cultivation
1 . The forest cover is cleared, and dried vegetation is burned.
2 . The crop is planted.
3 . Soil fertility is short-lived. Typically the land will only produce harvests for 2-5 years.
4 . The land must lie fallow for 10-30 years before it will again be able to produce a crop.
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Why might the following nuclear reaction not be very good for energy production in a fusion reactor? Fe + Fe ? Te
A) The material only produces a few neutrons so the chain reaction will not be very efficient. B) The reactants are too stable and it would cost energy to produce the product due to strong nuclear force. C) The products are not the right size to obtain any energy from the missing mass due to the strong nuclear force. D) The mass of the byproducts is too high and therefore the energy released will not be high enough. E) Interatomic attraction between the products will impede the separation of the atoms from the unstable nuclei.
The general circulation:
A) is an annual land-sea breeze. B) is approximated by a three cells motion model. C) is not responsible for the Intertropical Convergence Zone (ITCZ). D) contributes nothing to the redistribution of heat energy in the earth-atmospheric system. E) none of the above
Carbonic acid forms from a combination of ____
A)water and bicarbonate ion B)water and carbon dioxide C)carbon dioxide and hydrogen ion D)calcium ion and bicarbonate ion
When water changes from one state to another, ________ heat is stored or released.
reduced fusion latent elemental