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Answer Key
Grade 8 Science: Human Impacts & Engineering Solutions for Earth
1.
Sustainability
2.
pollution
3.
Acid
4.
marine
5.
Bio/Biological
6.
erosion/carbon release
7.
timescales
8.
millions of years
9.
using resources to meet present needs while preserving resources and environments for the future
10.
farm runoff, industrial discharge, sewage, plastic litter (any two)
11.
variety of life in an area; supports stability, food, medicine, and ecosystem services
12.
renewable replenish relatively quickly; nonrenewable are finite on human timescales
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