[Free Registration/Login may be required to access all resource tools.] The seismic waves that emanate from earthquakes include body waves and surface waves. Learn how scientists use seismic waves to learn about the Earth's interior.

[Free Registration/Login may be required to access all resource tools.] Describes how sediments weather, erode, and are deposited in a sedimentary environment.

[Free Registration/Login may be required to access all resource tools.] Explains that sedimentary rocks are classified by how they formed and by grain size.

[Free Registration/Login may be required to access all resource tools.] Elaborates on radioactive decay as a tool for determining the age of certain minerals and other materials, including the limits of the technique.

[Free Registration/Login may be required to access all resource tools.] Introduces Steno's laws, which allow scientists to decipher the geological events that occurred and the order in which they took place, including how the relative...

[Free Registration/Login may be required to access all resource tools.] Explains how to prevent hazardous waste pollution and how the Superfund Act regulates this type of pollution.

[Free Registration/Login may be required to access all resource tools.] Looks at how meteorologists predict the weather.

[Free Registration/Login may be required to access all resource tools.] Looks at how the human population has grown. Some consume a tremendous amount of resources and produce a lot of waste.

[Free Registration/Login may be required to access all resource tools.] Describes some factors that lead to long-term climate changes.

[Free Registration/Login may be required to access all resource tools.] The lithosphere is made of the brittle crust and uppermost mantle and lies on the plastic asthenosphere. Read about the properties of the lithosphere and asthenosphere.

[Free Registration/Login may be required to access all resource tools.] Indicates the factors that lead to landslides and other mass movements, what their characteristics are, and how to avoid them.

[Free Registration/Login may be required to access all resource tools.] Describes the features of intrusive and extrusive igneous rocks that cool slowly and rapidly, respectively.

[Free Registration/Login may be required to access all resource tools.] Discusses the impacts of hazardous waste on the environment and human health, and the provisions of the Superfund Act.

[Free Registration/Login may be required to access all resource tools.] Presents igneous rocks, which form from magma, and the two types: dense, dark mafic and less dense, light felsic. Also covers Bowen's Reaction Series.

[Free Registration/Login may be required to access all resource tools.] Presents the classifications of igneous rocks based on silica content.

[Free Registration/Login may be required to access all resource tools.] Identifies some of the valuable minerals and metals, and how they are located, mined, and refined.

[Free Registration/Login may be required to access all resource tools.] Distinguishes how to tell which rock unit is older than the ones around it and so reveal the geologic history of the region.

[Free Registration/Login may be required to access all resource tools.] Describes the various instruments that scientists use to measure weather conditions, including advanced tools like satellites and radar.

[Free Registration/Login may be required to access all resource tools.] Describes the air pollutants released from fossil fuels, biomass burning, and volatile organic compounds.

[Free Registration/Login may be required to access all resource tools.] Explains the cycle of carbon through the atmosphere, geosphere, and biosphere.

[Free Registration/Login may be required to access all resource tools.] Describes features of the seafloor and how they are mapped by echo sounding. It touches upon the continental margin as well.

[Free Registration/Login may be required to access all resource tools.] Presents information on the compounds that pollute the air, their sources, and the regions in which air quality is chronically bad.

[Free Registration/Login may be required to access all resource tools.] Reveals how human population growth has paralleled advances in agriculture, such as the advent of agriculture, and the onset of the Green Revolution.

[Free Registration/Login may be required to access all resource tools.] Covers parts of the central nervous system and their functions.