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| ashwinpai.com | History of earth | The Moon | Geography | Environment and ecosystem | Natural resources | Human geography | Descriptions of Earth |
Natural resources
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Earth's crust contains large deposits of fossil fuels: (coal,
petroleum, natural gas, methane clathrate). These deposits are used
by humans both for energy production and as feedstock for chemical
production. Mineral ore bodies have been formed in Earth's crust by the action of erosion and plate tectonics. These bodies form concentrated sources for many metals and other useful elements. Earth's biosphere produces many useful biological products, including (but far from limited to) food, wood, pharmaceuticals, oxygen, and the recycling of many organic wastes. The land-based ecosystem depends upon topsoil and fresh water, and the oceanic ecosystem depends upon dissolved nutrients washed down from the land. |
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Some of these resources, such as mineral fuels, are difficult to
replenish on a short time scale, called non-renewable resources. The
exploitation of non-renewable resources by human civilization has
become a subject of significant controversy in modern
environmentalism movements. Land use Arable land: 10% Permanent crops: 1% Permanent pastures: 26% Forests and woodland: 32% Urban areas: 1.5% Other: 30% (1993 est.) Irrigated land: 2,481,250 km2 (1993 est.) Natural and environmental hazards Large areas are subject to extreme weather such as (tropical cyclones), hurricanes, or typhoons that dominate life in those areas. Many places are subject to earthquakes, landslides, tsunamis, volcanic eruptions, tornadoes, sinkholes, floods, droughts, and other calamities and disasters. Large areas are subject to man-made pollution of the air and water, acid rain and toxic substances, loss of vegetation (overgrazing, deforestation, desertification), loss of wildlife, species extinction, soil degradation, soil depletion, erosion, and introduction of invasive species. Long-term climate alteration due to enhancement of the greenhouse effect by human industrial carbon dioxide emissions is an increasing concern, the focus of intense study and debate. |
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Benefits of Drinking Tea
There are lots of reasons I enjoy a hot cup of tea: I love the aroma of various
flavors of tea; holding onto a hot tea mug warms my hands on a cold winter ...
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| ashwinpai.com | History of earth | The Moon | Geography | Environment and ecosystem | Natural resources | Human geography | Descriptions of Earth |