1. Earth’s Resources
Chapter 24

2. Renewable
Non-Renewable

3. The World at Night

4. Resources
The resources that Earth provides are called natural resources
These can be classified as renewable or non- renewable

5. Renewable Resources
a renewable resource is one that can be replaced by nature in a relatively short period of time.
cut down a tree...plant a seedling
fresh surface water...water cycle
animals and elements that travel through cycles in Earths systems are also renewable

6. Sustainable Yield (part of renewable resources)
resources have sustainable yield if we replace them at the same rate we use them.
plants (crops) and animals (livestock) are in this category
The sun is considered sustainable because it will be there for the next 5 billion years

7. non-renewable resources
a resource is non-renewable if it has a finite amount and can only be replaced by geological, physical or chemical process that take millions of years.
These include mineral deposits and fossil fuels.

8. Distribution of Resources
Obviously resources are not evenly distributed around the world.
We only have about 6% of the world’s population, yet we consume 30% of the resources yearly.

9. Resources From Earth’s Crust
24.2

10. Land Resources publicly managed land - federal, state or local
for recreation, grazing and mineral and energy resources
national parks, national wildlife refuges,

11. aggregate - an combination of sand, gravel and crushed stone.
beneath aggregate is bedrock which is the unbroken parent material for overlying layers
this bedrock can be mined is quarries
Ores -natural resource that can be mined at a profit
These cal fall into several categories: settling of crystals, hyrdrothermal fluids, chemical precipiation and placer deposits.

12. Effects of Mining
Mining can destroy the original contour of the surrounding land
many times when ores are extracted from parent rock, the residual material is called tailings.
mining can also expose other materials like arsenic and mercury
these also have environmental concerns/impact

13. In 1984, the scientific world woke up to the existence of radon in homes. A construction engineer triggered radiation alarms while entering the Limerick nuclear power plant near Philadelphia. His home in Boyertown was tested and the radon concentration was a shocking 2,700 pCi/L. (2-4pCi/L is normal)
The family, including small children, was immediately evacuated. Very high radon levels were also found in nearby houses. This region, known as the Reading Prong, has low-grade uranium deposits and encompasses parts of Pennsylvania, New Jersey, and New York.

14. Air Resources
24.3

15. Origin of Oxygen
It is believed that between 4.5 and 4.6 billion years ago, Earth’s atmosphere was primarily CO2, Water vapor and nitrogen
As the crust cooled, rains washed much of the CO2 out of the atmosphere and into the oceans where phtotsynthetic organisms released the oxygen into the atmosphere

16. Cycles of Matter
Carbon Cycle
Nitrogen Cycle

19. Natural Air Pollution Sources
Volcanoes
Fire
Radon

20. Transport and Dilution
water and air not only transport pollutants but dilute them as well.

21. Water Resources
24.4

22. Useful Properties of Water
Liquid water - water is very versatile... high boiling and low freezing temps
The hydrogen bonds allow water to stick to and coat many solids.
Thermal energy storage capacity - a lot of thermal energy (heat) is stored before a change in temperature
helps regulate earth’s temperature

23. Water as a solvent - water as a liquid dissolves many kinds of compounds
this enables water to transport minerals throughout organisms as well as dilute pollutants inside the body and in the environment
Solid Water - Water expands when it freezes, and as a solid is less dense than as a liquid

25. Location of Freshwater Resources
Like all resources, fresh water is not evenly distributed throughout the world.
This can lead to a need to travel great distances to obtain water (less developed countries) or piping water great distances

26. Managing Freshwater Resources