Contamination refers to…
building new houses
making something dirty or unsafe
protecting animals from danger
cleaning something very carefully
Large areas of forest are disappearing because of _____, often caused by farming and logging.
erosion
strain
deforestation
emission
Emission is best defined as…
planting large numbers of trees
reducing waste
gas or pollution in the air
releasing endangered animals
A healthy _____ includes plants, animals, bacteria, and their natural environment.
pollutant
fertilizer
ecosystem
erosion
Erosion happens when…
rivers get polluted
animals move to a new area
soil or rock is worn away
the earth dries up and plants die
Farmers often use _____ to help crops grow faster.
fertilizers
pollutants
threats
emissions
A pollutant is…
something that damages the environment
something that creates more energy
something that helps clean the water
something that is safe for plants
If a city’s water supply is under strain, it means…
the city has too much water
the water is clean
the water level is rising
the system is struggling
A threat to the environment is something that…
protects nature
causes harm
Air pollution can lead to _____ health problems that last for years.
vital
viable
sustainable
chronic
Something devastating is…
useful for the environment
extremely harmful
easy to repair
slightly beneficial
Cutting down ancient forests causes _____ damage that cannot be undone.
sustainable
vital
viable
irreversible
A pervasive problem is one that exists only in one small place.
True
False
Sustainable actions are those that…
destroy natural habitats
work only for a short time
use up all resources quickly
are not harmful
Dealing with climate change can be very _____, because it requires time, money, and effort.
unprecedented
vital
taxing
viable
Unprecedented means…
slow and gradual
never seen before
very easy to predict
extremely common to see
