Earth Resources. What did you have for breakfast? Every day, you eat food and drink water because these resources are needed to live In addition to food.

Earth Resources

What did you have for breakfast? Every day, you eat food and drink water because these resources are needed to live In addition to food and water, most animals also need shelter Think about the resources used to provide you shelter All these materials come from Earth

Natural Resources Resources that Earth provides are natural resources Include Air, water, and land All living things Nutrients Rocks Minerals

Have you ever recycled? Nonrenewable Have you ever mowed a lawn or planted a garden? Renewable Both types of resources are necessary for life.

Renewable Resources If we cut down a tree, we can replace that tree by planting a seedling in its place. Trees are examples of renewable resources Natural resources that are possible to use indefinitely without causing a reduction in the available supply Air Fresh surface water Most groundwater Living things Elements that cycle through Earth systems (carbon, nitrogen, phosphorous)

Renewable resources exist in an inexhaustible supply (ex. Solar energy) Replaced through natural processes at a rate that is equal to, or greater than, the rate at which they are being used.

Living Things Organisms in the biosphere are important renewable resources Plants crops Animals Forests for paper 10 to 20 years Trees for timber up to 60 years Sustainable yield replacement of renewable resources at the same rate at which they are consumed

Nonrenewable resources Why are diamonds so expensive? Supply is limited, when all diamond mines are exhausted, no more natural diamonds will become available Diamonds = Nonrenewable resource A resource that exists in a fixed amount in various places in Earths crust and can be replaced only by geological, physical, and chemical processes that take hundreds of millions of years.

Resources such as: Fossil fuels Gemstones Gold Copper Silver Exhaustible because they are being extracted and used at a much faster rate than the rate at which they were formed.

Distributed Evenly? Are natural resources distributed evenly on Earth? The availability of natural resources helps determine the wealth and the power of countries around the world. US = many natural resources Small countries Surinam and Guyana Saudi Arabia and Kuwait

Land Resources Land is a valuable natural resource Provides places to live and interact Also growth of crops, forests, grasslands, and for wilderness areas Of all the land in the US 42% is public land Federally administered to protect timber, grazing areas, minerals, and energy resources

National Parks Preserve scenic and unique natural landscapes National wildlife refuges Provide protection of habitats and breeding areas for wildlife, and some endangered species

Soil It can take up to 1000 years to form just a few centimeters of topsoil, but it can be lost in a matter of minutes Erosion by wind or water Today topsoil is eroding faster than it forms Why? Plowing or leaving bare ground without plant cover

Each decade Earth loses 7% of its topsoil In arid and semi-arid areas of the world, the loss of topsoil leads to desertification Process whereby productive land becomes desert.

Bedrock Underneath topsoil you have several layers of soil on top of solid rock. Bedrock is solid rock that may consist of limestone, granite, marble, or other rocks that can be mined in quarries Used in construction Buildings monuments

Aggregates Mixture of gravel, sand, and crushed stone that naturally accumulates on or close to Earths surface. Found on floodplains, alluvial fans Glacial deposits Used in construction to form concrete or mortar

Ores Natural resource that can be mined at a profit Mined as long as its value on the market is greater than the cost of extraction Hematite Iron ore that contains 70% iron by weight Ores are classified by the manner in which they formed

Settling of Crystals Hydrothermal fluids Chemical precipitation Placer deposits Heavy materials settle out (gold) Concentration by weathering

Other Land Resources Clay Used in bricks, china, ceramics, tiles, pottery, papermaking Salt Gypsum Talc Graphite

Air Resources Life forms on Earth continue to survive as a result of a balanced gas exchange Volcanoes release various gas particles Photosynthetic organisms use carbon dioxide and release oxygen Other organisms do the opposite Human activities are disrupting these cycles

Sources of Air Pollution?

Water Resources 71% of Earths surface is covered by water Oceans help regulate climate, provide habitats, dilute pollutants, shape Earths surface Most animals are 50-65% water Without water life could not exist

Freshwater Resources Freshwater resources are not distributed evenly across Earths landmasses US eastern states gets ample rain Used for cooling, energy production, and manufacturing Western states too little rain Use majority for irrigation Use groundwater faster than it can be recharged

Uses of Freshwater?

Desalination Some countries have explored the possibility of converting ocean water into freshwater Desalination occurs when salt water is distilled

Earth Resources. What did you have for breakfast? Every day, you eat food and drink water because these resources are needed to live In addition to food.

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