Name ________________________ Date _______________ Block ________ Sedimentary Rocks & Weathering Notes Sedimentary Rocks Sedimentary Rocks are formed from the weathering , erosion and deposition of existing rocks. o Weathering - physically or chemically breaking the rock down into small fragments o erosion - movement of sediment from one place to another o deposition - sediment settles in a new location. sediments are deposited in layers and compacted + cemented to make sedimentary rock. Sedimentary rocks often have a layered look. stratification - the process by which sedimentary rocks are arranged in layers. Sedimentary rocks often record ripple marks and mud cracks What is Weathering? The process that breaks down rocks and other substances at earth’s surface Heat, cold, water and ice all contribute to weathering. Two Types of Weathering: chemical Weathering mechanical/physical Weathering Mechanical Weathering Mechanical weathering breaks rock into pieces by freezing release of pressure of actions of animals and abrasion The type of weathering in which is physically broken into smaller pieces. Organic Activity Roots of trees and other plants enter cracks in rocks. As the roots grow they force the cracks farther apart. Overtime the roots of even small plants pry apart cracked rocks.
- Spring '09
- clastic sedimentary rocks, Stratification, Sediments