1. HUMANS IN THE BIOSPHERE
ECOLOGY
HUMANS IN THE BIOSPHERE

2. Humans in the Biosphere
The biosphere is the part of the Earth where life exists, including the land, water, and air.

3. Human activities that affect the biosphere are:
HUNTING

4. Human activities that affect the biosphere are:
GATHERING

5. Human activities that affect the biosphere are:
AGRICULTURE

6. Human activities that affect the biosphere are:
INDUSTRY

7. Human activities that affect the biosphere are:
URBAN DEVELOPMENT

8. Humans in the Biosphere
The use of modern agricultural techniques developed in the 20th century that increased the food supply was called the Green Revolution.

9. Humans in the Biosphere
Renewable resources can be replenished by a biochemical cycle if they are non living and can regenerate if they are living.

10. Humans in the Biosphere
Even though most animals need oxygen to survive, it is a renewable resource because it is replenished through photosynthesis.

11. Humans in the Biosphere
Pine trees that are grown on farms and used for building materials can be regenerated (re-grown).

12. Humans in the Biosphere
A renewable resource is NOT unlimited. Although water is replenished through the water cycle, if it becomes polluted or there is a drought, it is limited.

13. Humans in the Biosphere
Human activity affects the quality and supply of renewable resources.

14. Humans in the Biosphere
Using a natural resource without using it up is called Sustainable Development.

15. Humans in the Biosphere
A Nonrenewable resource cannot be replenished by natural processes.

16. Humans in the Biosphere
Fossil fuels like coal and gas take millions of years to be replenished.

17. Humans in the Biosphere
A redwood forest is nonrenewable because it would take thousands of years to regenerate if it was destroyed.

18. Humans in the Biosphere
Overgrazing, poor farming practices, and drought can turn productive land into a desert – the process is called desertification.

19. Humans in the Biosphere
The loss of forests leads to severe erosion - the process is called deforestation.

20. Humans in the Biosphere
Smog: a mixture of chemicals that causes a gray-brown haze in the air. Smog usually occurs in big cities.

21. Humans in the Biosphere
A pollutant is anything harmful that enters the biosphere through the land, water, or air.

22. Humans in the Biosphere
Burning fossil fuels causes acid rain which can damage or kill plants.

23. Humans in the Biosphere
The variety of organisms in the biosphere is called Biodiversity.

24. Humans in the Biosphere
Biodiversity provides us with foods and medicines.

25. Human activity reduces biodiversity by
destroying habitats

26. Human activity reduces biodiversity by
hunting species to extinction

27. Human activity reduces biodiversity by
introducing toxins into the food web

28. Human activity reduces biodiversity by
introducing foreign species into the environment

29. Humans in the Biosphere
When concentrations of harmful substances increase in organisms at higher trophic levels, it is called Biological Magnification.

30. Humans in the Biosphere
An Invasive Species is one that has immigrated to a place where they are not native.

31. Humans in the Biosphere
The Ozone Layer is a layer in the Earth’s atmosphere with a high concentration of ozone gas. It absorbs harmful UV radiation which causes sunburns. It is the Earth’s sunscreen.

32. Humans in the Biosphere
Global warming is the increase in the average temperature of the biosphere. Melting polar ice is a sign of global warming.