Vocabulary Preview
Match each word or phrase with the correct definition.
1.
alien
a.
specific kinds of plants or animals
2.
extinct
b.
no
longer existing
3.
grim
c.
from another place
4.
habitat
d.
belonging to a particular place
5.
native
e.
gloomy; somber
6.
species
f.
an environment where
something lives and grows
Pre-Reading Questions
Think about the following questions.
1.
In what ways do humans cause damage to the planet?
2.
Do you think that humans are in danger of becoming extinct?
Why or why not?
3.
What are some things we can do to help prevent the extinction
of a species?
Sixth Extinction
E n v i ro n m e n t a l I s s u e s
1
U N
I
T
5
54
Sixth Extinction
5
10
15
20
25
M
ost species of plants and animals that have
ever lived on Earth are
now extinct. Though most have become extinct slowly, some have
been almost completely
wiped out in a sudden, massive,
catastrophic
event. These mass extinctions have happened at least five times
in the history of the Earth. The first mass extinction occurred about 450 million
years ago, when
sudden changes in sea level, caused by melting
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