Chichén Itzá in Mexico's Yucatán Peninsula and Tikal in northern Guatemala are very significant Incan ruins
Indicate whether the statement is true or false
F
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For each of the following unbalanced equations, which is depicted: oxidation or reduction?a) Cr ? Cr3+b) Sn ? Sn(OH)42-
A. a) reduction; b) oxidation B. a) oxidation; b) oxidation C. a) reduction; b) reduction D. a) oxidation; b) reduction
Ocean energy is difficult to harness because ____
A)energy can only be harness in nearshore areas B)the salt in the ocean will corrode machinery C)the energy is not very concentrated D)there are so many different ways energy is generated in the ocean E)the cost makes it economically unfeasible
Soil erosion is primarily a major problem only at the site where it occurs
Indicate whether the statement is true or false
The amount of ground water is ________ that of all rivers and lakes combined.
A. very minor when compared to B. equal to C. many times D. of uncertain amount compared to E. a little less than