earth science 3 3
TRANSCRIPT
Sedimentary Rocks 3.3
Erosion• The incorporation and transportation of
material by a mobile agent, such as water, wind, or ice.
Deposition • The process by which an agent of erosion
loses energy and drops the sediment it is carrying; also the process by which water vapor is changed directly to a solid without passing through the liquid state.
Compaction• Process by which sediments are
squeezed together by the weight of overlying materials driving out water.
Cementation• Solidification of sediments by the
deposition of dissolved minerals in the tiny spaces between the sedimentary particles.
Clastic Sedimentary Rock• A sedimentary rock made of broken
fragments of preexisting rock.
Chemical Sedimentary Rock• Sedimentary rock consisting of material
that was precipitated from water by either inorganic or organic means.
Key Concept
• Describe the major processes involved in the formation of sedimentary rocks.–Erosion involves weathering and the
removal of rock. When an agent of erosion-water, wind, ice, or gravity-loses energy, it drops the sediments.
Key Concept
• What are clastic sedimentary rocks?–A sedimentary rock made of broken
fragments of preexisting rock.
Key Concept
• What are chemical sedimentary rocks?–Sedimentary rock consisting of
material that was precipitated from water by either inorganic or organic means.
Key Concept
• What features are unique to some sedimentary rocks?–The many unique features of
sedimentary rocks are clues to how, when, and where the rocks formed.