Which phrases describe both lakes and ponds? Check all that apply. 0 contain still, standing fresh water
0 have no plants growing at the bottom
0 formed by rainfall, melted snow and ice, or runoff
0 formed by lava or mud blocking a river
0 created by building a dam on a river
0 are shallow enough that sunlight reaches the bottom

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.

gas and precipitate r the correct answers