4th grade-ch. 4 lesson 3 how do environments change
Post on 18-Dec-2014
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Ch. 4 Lesson 3How do
environments change?
succession•gradual change in an ecosystem
•climates change slowly
succession
•occurs in
stages
extinct• species has completely died out
• caused by climate changes, volcanoes, meteors
extinction in modern times caused by human
activities-ex. habitat destruction
passenger pigeon
endangered• species that is reduced & may die out
• in danger of becoming extinct
There are only about 1,600 pandas left in the wild, and about 160 living in zoos.
Find the Endangered Animals game
black rhinoceros
threatened• species
may soon become endangered- just a step behind becoming endangered
giraffe
green sea turtle
extinct
endangered
threatened
fossils• show that Earth has changed
over time
• tell us about environment long ago
Fossils show that woolly
mammoths are similar to today’s _____________elephants
Factors that cause rapid
environmental changes :
hurricanes
fire
floods
volcanic eruptions
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