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Unit 3 Crossword Puzzle

Across
vegetation is damaged and the ground becomes liable to erosion.
a thick subsurface layer of soil that remains frozen
cause something to be vulnerable or at risk
clearing or removal of a forest or stand of trees
a forest fire that burns only surface litter and undergrowth.
widespread and rapid decrease in the biodiversity
widespread and rapid decrease in the biodiversity
trapping of the sun's warmth in a planet's lower atmosphere
commercial fishing technique
a forest fire that spreads from treetop to treetop.
the flora and fauna found on the bottom
a measure of the degree to which the water loses its transparency
aquatic animals that are able to swim and move independently of water currents.
Down
land that separates waters flowing to different rivers, basins, or seas.
the weather conditions prevailing in an area in general or over a long period.
seriously at risk of extinction
A lake with excessive nutrient concentrations and thus high productivity
open country used for grazing or hunting animals.
unwanted fish and other marine creatures caught during commercial fishing for a different species.
small and microscopic organisms drifting or floating in the sea