The definition of a natural resource is something that is found in nature that is useful to humans. All natural resources are finite, meaning once they are used, they cannot be replaced. Many valuable natural resources, such as gold and oil, have been nearly depleted, while others are still abundant.
Common natural resources include trees, rocks, minerals, crude oil, fossil fuels, zinc, iron ore, lead and copper. Things such as sunlight, water and air are also considered to be natural resources, although these things do not have a monetary value. However, something such as water can be used to produce energy, which does have a monetary value.Learn More
A constructive force creates or builds something on the earth. For instance, volcanoes are built up by constructive tectonic plate movement. Destructive forces like tornadoes and tsunamis tear down or wear away parts of the earth.Full Answer >
Landslides often have devastating effects on humans. The wall of mud wipes out buildings, covers roads and changes the landscape. The economic cost of landslides in the United States ranges from $1 billion to $2 billion annually. NBC News reports a death toll of 41 individuals with two missing from the March 22, 2014, landslide in Oso, Washington.Full Answer >
Life could not exist on Earth without trees because they produce most of the oxygen that humans and wildlife breathe. Trees absorb carbon dioxide from the atmosphere and release oxygen using the process of photosynthesis. There would also be no rain without trees, since trees absorb water from the soil and release it through evapotranspiration. Water vapor released through evapotranspiration is the major mechanism by which air is remoistened.Full Answer >
Mass movement, or mass wasting, has significant effects on humans, including loss of property, severe injury and death. This has become a larger problem as the human population grows and people have spread over more previously uninhabited land. The effects are also greater in underdeveloped countries that lack zoning laws, information and disaster preparedness.Full Answer >