Renewable and Nonrenewable Resources The _____ provides humans and all living organisms with many _________________. The resources provided to all living things can be classified into two groups: Earth goods and services Renewable resources and Nonrenewable resources

These are resources that….. Renewable Resources These are resources that….. can regenerate if they are alive or can be replenished if they are nonliving. A tree is a renewable resource since: a new tree can grow if an older tree dies or is cut down.

Nonrenewable Resources Examples include: fossil fuels, such as coal, oil and natural gas. These resources: cannot be replenished by natural processes. When a nonrenewable resource is depleted, it is gone forever.

Land Resources Land is a resource that not only provides ______ for humans to live, but also provides the: soils in which crops are grown. space If managed properly, soil is a __________ resource. However, if it is mismanaged, it can be permanently ________. renewable damaged Fertile soil is a mixture of sand, clay, rock particles and humus. Humus is the material that comes from ______________. dead organisms

One impact humans have had on soil is __________. soil erosion Plowing the land removes the roots that hold the soil in place. Erosion is the wearing away of surface soil by water and wind.

In certain parts of the world with ____ climates, a combination of: farming, overgrazing and drought has turned productive areas into _______. dry deserts This process is called ____________ and can be guarded against by careful _______________. desertification land management

In many parts of the world, wood is still the ____ that is used for: Earth’s forests not only provide essential __________________, but they also serve essential: ecological functions. Forest Resources resources for humans Humans need the _____ from forests to make products ranging from ______________. In many parts of the world, wood is still the ____ that is used for: cooking and heating. wood homes to paper fuel

Ecologically, the forests play a far greater role. b) Photosynthesis uses the energy from the sun and stores this energy in molecules of glucose and other organic compounds. These molecules form the basis of every food chain and food web. c) The forests provide: habitats for many other organisms. d) The forests: moderate the climate. a) Photosynthetic plants remove carbon dioxide from the atmosphere and replace it with oxygen. e) Forests help to: limit soil erosion.

Some forests may be considered __________ resources while others are _____________. renewable nonrenewable The _________ forests of the northeastern United States can be considered __________. Most of these forests have already been cut once and have grown back naturally. temperate renewable

This is the loss of forests. Deforestation: This is the loss of forests. Deforestation

As trees are cut, they can be replanted. There are many ways that the forests can be used for their resources if strategies are employed to maintain them: Mature trees can be __________________ from a forest ecosystem, rather than: clear-cutting large sections of the forest. This will promote the growth of ____________ and ________ the forest ecosystem. selectively harvested younger trees preserve As trees are cut, they can be replanted. _________ can be planted and harvested, making them renewable resources. Tree farms Geneticists are now breeding ____________ varieties that produce __________ wood. faster-growing high quality

Overfishing is harvesting fish faster….. Fishery Resources Aquatic ecosystems are home to many species of ____ and other animals (__________________) that serve as food for _______________ worldwide. fish clams, crabs, shrimp millions of people Overfishing is harvesting fish faster….. ……than they can be replaced by reproduction. It is causing a severe reduction in some fish species.

In 1950, it is estimated that the world catch of fish was about ____________. 19 million tons By 1990, the world catch had increased to over _____________ of fish. The population of some species of fish has ________ so low that scientists fear they may _________ altogether. 90 million tons dropped disappear The fisheries of the oceans should be a _________ resource. If managed _________, humans can ____ on fish as a source of ____ while maintaining the _____________. renewable effectively rely food fish populations

the raising of aquatic animals for human consumption. Aquaculture is: the raising of aquatic animals for human consumption. Aquaculture is a method that will…. ….help sustain fish populations and provide food for humans.

Air Resources Obviously, air is a resource that all living organisms are __________ upon. The condition of the air affects the ______ of not only humans, but all living things. dependent health

Smog: Smog is a mixture of chemicals in the air that appears as a haze in the atmosphere. It is due primarily to…. …. automobile exhausts and industrial emissions. Smog is considered a _________. A pollutant is: ….a harmful material that can enter the biosphere through the land, air or water. pollutant

burning of fossil fuels chemicals ash and dust The __________________ fills the atmosphere with _________ as well as particles of ____________ that can cause health problems. Fortunately, most industries today use technology to control the ________________________. burning of fossil fuels chemicals ash and dust emissions from smokestacks Automakers also have strict emission standards that must be met on automobile exhausts. As a result, air quality of most American cities is improving, but this is an on-going problem in other parts of the world.

….kill plants, damage soils, and poison aquatic ecosystems. When _________________ are released into the atmosphere, they combine with ___________ to form droplets of _____ acid and _______ acid. nitrates and sulfates Acid Rain water vapor nitric sulfuric These droplets fall back to the land surface as _______. acid rain Acid rain can…. ….kill plants, damage soils, and poison aquatic ecosystems.

Freshwater Resources This is going to be FUN!! Americans use _______________ of fresh water every day. Even though water is a _________ resource, the supply of fresh water is _______. billions of gallons renewable limited Priority must be given to protecting water supplies from _________ and finding ways to better manage our _________________. pollution water consumption

Pollutants enter water supplies in several ways: a) Chemicals are often improperly discarded. b) The heavy use of fertilizers and pesticides enter waterways through runoff water. c) Discarded wastes can seep through the soil and enter underground water supplies. d) Domestic sewage from sinks and toilets contains nitrogen and phosphorus compounds that cause algae blooms and growth of bacteria in aquatic habitats.