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definitions henry

science def.

ozone layer layer of ozone O3 in the atmosphere 15-50 km above earth's surface to protect from uv rays
monitoring keep track of something
invertebrates animals without backbones
parts per million ppm 0.001=1000000
spring acid shock sudden drop of ph
toxic poisonous
toxicity how poisonous a substance is
toxins poison
ld 50 lethal dose 50
heavy metals 6 poisonous metals copper zinc lead etc.
sulfur dioxide forms when sulfur combines with oxygen in the air
nitrogen oxides a major air pollutant
global warming breaking down of the ozone layer
Created by: lolfreakmaster