Primary project

1. WHATCAUSESEXTINCTIONONEARTH?
By Sara and Carla

2. 1. POLLUTION
Ithappenswhentoxicandpoisonouschemicalscontamine(pollute)theair,soilandwater.

3. 2.DEFORESTATION
Deforestationhappenswhenwecutdowntoomanytrees.

4. CONSECUENCES OF DEFORESTATION
1 There is more carbon dioxide because plants will not
absorb it.
2There is les oxigen because plants will not release it.

5. 3. INVASIVE SPECIES
Whentheyarrivedtoanewecosystem,theycanchangeitcompletely.Sometimes,theykillotherspeciesofthatecosystem.
Someexamplesare:

6. ÑÇKMP97YH97
KILLER ALGAE

7. AMERICAN CRAB

8. ARGENTINIAN PARROT

9. ZEBRA MUSSEL

10. ALICANTO

11. 4.GREENHOUSE EFFECT
When the sun rays reach the Earth three tings can
happen:

12. 1.SomeraysareabsorbedbytheEarth

13. 2.Some rays are reflected by the Earth.

14. 3. Some rays are absorbed by a layer of gases that surrounds the
Earth. This layer acts like the glass of a greenhouse.

15. 5.OVERPOPULATION
Overpopulation happens when the number of people in
world is growing and growing.

16. The problems are that:
There are less plants because of deforestation , pollution,
global warming,invasive species and less rain.This means
that there will be less food for the growing population.