Presentation on theme: "Earth’s Resources What are natural resources? Natural Resources - resources that the Earth provides What are examples of natural resources? Air, water,"— Presentation transcript:
Earth’s Resources What are natural resources? Natural Resources - resources that the Earth provides What are examples of natural resources? Air, water, land, living things, nutrients, rocks, minerals Some natural resources are cycled through the environment Carbon cycle, water cycle
Earth’s Resources What are renewable resources? Renewable Resources - natural resource that can be used indefinitely without causing a reduction in the available supply What are examples of renewable resources? Fresh air, fresh surface water (lakes, rivers, streams, groundwater), fertile soil, elements that cycle through Earth’s systems (nitrogen, carbon, phosphorus), living things, solar energy
Earth’s Resources Renewable Resources Living Things - Why are these considered “renewable?” Plants and animals reproduce (even if raised for food, they can be replaced in short periods of time) What about trees that are cut down for paper? They are replanted and ready for harvest again in 10-20 years Timber? About 60 years
Earth’s Resources Renewable Resources Sustainable Yield - The replacement of renewable resources at the same rate at which they are consumed How can we positively affect sustainable yield on a forest of trees? How can we negatively affect sustainable yield?
Earth’s Resources What are nonrenewable resources? Nonrenewable resources - a resource that exists in a fixed amount in various places in Earth’s crust and can be replaced only be geological, physical, and chemical processes that takes hundreds of millions of years What are examples of nonrenewable resources? Diamonds, fossil fuels, gemstones, gold, copper, silver
Earth’s Resources Nonrenewable Resources Why are resources nonrenewable? Nonrenewable resources are exhaustible because they are being extracted and used at a much faster rate than the rate at which they are formed