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Science Unit C Section 2 Crossword

By, Brayn Tran, Franklin Walker, Billy Quan 9A

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Across
1.Is the amount required to kill off half the test animals after a specific dose
8.Liquid that dissolves and carries substances as it passes through soil
9.Major air pollutant: forms when nitrogen combines with oxygen (2 Words)
11.A layer in the earth’s stratosphere (2 Words)
12.Measurement of Acidity
14.A substance used to destroy pests
16.Animals without backbones
18.Increase in concentration of a chemical or element as it moves up the food chain
19.A substance that is toxic to plants and used to kill unwanted vegetations
20.Major air pollutant: forms when carbon combines with oxygen (2 Words)
Down
2.The process in which sediment is added to a land mass
3.This kind of membrane allows specific fluids to pass through it
4.Metals that are 5 times heavier than water (2 Words)
5.The measurement of how poisonous a substance is
6.The tiny spaces between soil grains
7.Gases in earth’s atmosphere that trap the heat that forms when radiant energy from the sun reaches earth’s surface (2 Words)
10.Measurement used to describe very small concentrations of chemicals (3 Words)
13.The level below which the ground is saturated with water (2 Words)
15.Water held underground in the soil or in pores and crevices in rock
17.The level of acid in a substance

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