How can a cave form from solid rock? Most caves are found in limestone, a rock made of materials of calcium carbonate. This rock is unusual because the solid minerals it is made of easily dissolve in weak acids. The most common weak acid in the environment is actually water!
Human beings have been linked to earth materials since prehistoric times. They used caves for shelter, shaped rocks into stone implements, and later refined metals to make tools. Beyond practical purposes, Earth materials also were used to make pigments for paint. Rock walls became canvases where ancient artists expressed themselves. In this exercise, we will explore the link between Earth materials and art.
What is sea ice? It is simply frozen ocean water. Why is sea ice important? While it occurs mainly in polar regions, sea ice influences our global climate. Changing amounts of sea ice can affect ocean circulations, weather patterns, and temperatures around the world. Sea ice insulates the relatively warm ocean water from the cold polar atmosphere, except where cracks in the ice allow for the exchange of heat and moisture. The exchange of salt between sea ice and the ocean alters the density of ocean waters, thus influencing ocean circulation. Many animals, such as polar bears, seals, and walruses, depend on sea ice for their habitat. These species hunt, feed, and breed on the ice. Satellites provide the best way to observe sea ice, the factors that affect sea ice, and the ways sea ice affects global climate. Scheduled to launch in 2010, NASA’s Aquarius mission will measure global sea surface salinity with unprecedented resolution. Even small variations in sea surface salinity — the amount of salt present near the ocean’s surface — can have dramatic effects on sea ice, the water cycle, and ocean circulation.
Scientists use seismic technology to map patterns of rock formations below the surface of the Earth. Different types of rocks affect sound waves. Geologists use these sound waves to locate rocks that may contain oil and/or natural gas. You can explore this principle with a tuning fork and various rocks. Gently strike a fork against the rocks. Note variations in sounds produced by different rocks. How could scientists use this information to help map the rock layers underground? In the following activity, you will explore one way scientists find oil beneath the Earth’s surface.
In this activity, students will conduct experiments or participate in demonstrations to answer questions about sky and weather phenomena. Students also will analyze and present data.
Are soils like M&Ms™? Yes! Find out more in this awesome activity provided by the Soil Science Society of America.
Discover more about soil properties in this excellent outdoor activity from the National Park Service!
Geodesy is the science that measures and represents the size and shape of Earth. In the United States, survey reference points are developed and maintained by NOAA’s National Geodetic Survey (NGS). In this activity, you will find data on the location and description of survey marks in your area and—if you like—search for them through a variation of geocaching.
The following activity can leverage SeisMac technology to help students understand how a seismometer records ground motions.
Geologic maps can tell you a lot about the rocks beneath your feet. You can use the legend with the map to figure out what rock types are in various geographic areas. The legend can also tell you in what geologic period those rocks formed. Geologists use such maps to help identify where natural resources are and where natural hazards are likely to occur. They are also critically useful in other ways, such as in making wise land use decisions.