When a solid is changed to a liquid phase, the solid
A) releases energy.
B) absorbs energy.
C) neither A nor B
B
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Below the first tier of world cities, the textbook describes five other tiers of settlements, ranked according to the type and extent of their business services
Indicate whether the statement is true or false.
Which statement is an example of a chemical change?
A. Confetti is cut from pieces of paper. B. Water evaporates from a lake. C. Ice cubes are formed in the freezer. D. A plant converts carbon dioxide into carbohydrates. E. A tree is cut down in the forest.
Primary productivity in nontropical terrestrial environments is typically limited by what nutrient?
A) K B) N C) Fe D) P
Animals or plants living on the sea bottom are ________
A) fish B) benthos C) nekton D) xerophytes E) part of the lithosphere