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Science Extra Credit

Across
large, irregularly shaped organelle that contains the green pigment needed for photosynthesis
path that a stream follows.
phospholipid layer that forms the outer covering of an animal cell and that is inside the cell wall of a plant cell; controls movement of materials into and out of the cell.
poisonous gas made of nitrogen and hydrogen.
solid metal dissolved in another solid metal.
change a substance undergoes when it turns into another substance.
all living organisms on Earth,in the air, on the land, and in the waters; the part of Earth where life exists.
interconnection of electrical elements forming a complete path for the flow of current.
blinding snow storm with winds of at least 56 km/hr, usually with temperatures below -7 oC.
Down
contamination of the atmosphere by the introduction of pollutants from human and natural sources.
smallest, basic unit of structure and function in a living thing; building block of life.
green substance needed for photosynthesis.
core of a very massive star that remains after a supernova explosion.
outermost boundary of plant and bacterial cells.
study of life and all living things; ecology, zoology, and botany are examples of biological sciences.
substance that increases the H+ concentration when added to a water solution.
double star system in which two stars revolve around each other.
small volcanic bomb about the size of a golf ball.
Rain that has become more acidic than normal due to pollution.