Weathering is the process of the weakening and breakdown of rocks, metals, and manmade objects. There are two main types of weathering: chemical and physical. An example of chemical weathering is acid rain. Caused mostly by the burning of fossil fuels, acid rain is a form of precipitation with high levels of sulfuric acid, which can cause erosion in the materials in which it comes in contact. An example of physical weathering is wind blowing across the desert playas.
This process causes rocks to form a specific pyramid-like shape and they are called ventifacts. Select from these resources to teach about the process of weathering in your classroom. Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth. Water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. Sedimentary rocks are one of three main types of rocks, along with igneous and metamorphic.
Metamorphic rocks start as one type of rock and—with pressure, heat, and time—gradually change into a new type of rock. Join our community of educators and receive the latest information on National Geographic's resources for you and your students.
Skip to content. Twitter Facebook Pinterest Google Classroom. Encyclopedic Entry Vocabulary. A cove is a type of small, shelter ed bay on the coast of an ocean , lake , or river. Sometimes, coves are smaller inlet s of larger bays or lagoon s.
When viewed from above, the spit of land creating the feature looks like the claw of a crayfish —cangrejo, in the native Spanish of the Argentine explorers who first identified the cove. Coves usually have narrow entrances. This protects the water of the cove from the turbulent current s and wave s of the larger body of water.
In fact, the word cove comes from the Old English word cofa, which means shelter or hut. Many ancient settlement s have been discovered on the shores of coves. In freshwater ecosystem s, such as lakes, coves provided safe access to water for drinking and hygiene. These processes are very long and take thousands of years. Facebook Twitter Instagram Pinterest Mail. News Ticker. Experiments [ 13 August ] Why fear wolves? Animals [ 6 August ] How strong is gravity on Mars? Astronomy [ 6 August ] Isaac Newton: from the apple to the law of gravitation Astronomy.
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