PPT-Weathering and Soils

Physical weather reduces the particle size of rocks and in doing so prepare the material for chemical weathering The rate of all chemical reactions involving solids is determined by the amount of exposed surface area These four drawing illustrates sequentially dividing particles into smaller particles Assuming a dimension of 1 cubic centimeter . Chapter 7 –Weathering and Erosion. Objectives:. Distinguish between weathering and erosion. Identify physical variables that cause mechanical weathering. Identify chemical variables that cause chemical weathering. Chapter 7. Section 7.1 Weathering. Weathering is the process by which rocks on or near Earth’s surface break down and change. . Erosion is the removal and transport of weathered material from one location to another.. Ms. Martel. Weathering. Weathering is the breakup of rock due to exposure to processes that occur at Earth’s surface.. Geologists group weathering processes under two headings, mechanical and chemical weathering. . Scenario #1. Flood water pounds against a canyon wall and wears it down.. Weathering. Scenario #2. Rain washing soil away from a hillside. Erosion. Scenario #3. Layers of sediment forming at the bottom of the ocean. Weathering and Erosion. Table of Contents. Section 1 . Weathering Processes. Section 2 . Rates of Weathering. Section 3 . Soil. Section 4 . Erosion. Chapter. 14. Section 1 . Weathering Processes. Predict how weathering might reshape surface features (topography). Weathering and Erosion. The top part of the lithosphere—the earth’s surface—changes as rocks are broken down to smaller pieces and carried away.. Unit 7 notes. Weathering. What is it?. Disintegration and Decomposition of rocks . Where does it happen?. At or near the surface of the Earth. Weathering. What does this process look like?. Weathering. Unit 7 notes. Weathering. What is it?. Disintegration and Decomposition of rocks . Where does it happen?. At or near the surface of the Earth. Weathering. What does this process look like?. Weathering. Weathering can be defined as any. chemical or mechanical process by which rocks exposed to weather undergo changes in character or are broken down into smaller pieces. .. Mechanical Weathering. Mechanical Weathering. Weathering. Notes. Weathering. - The surface processes that break down rock into small pieces called sediment. . Two Types of Weathering. MECHANICAL WEATHERING. – . . Physical. processes that break rock into fragments with the . Geomorphology (. GEO 301). Geology and Geophysics Department. College of Science. King Saud University. WEATHERING PROCESSES. Weathering is the breakdown of rocks by . mechanical disintegration . and chemical decomposition.. weathering and erosion. The process of weathering and erosion are the main forces behind landscape types. . However, they are not the only reason for a plain, plateau, or a mountain region to form. . The soil is the upper layers of the . regolith. that is accumulated materials of weathering product and thus supports plant growth. . Weathering Products. : . Product of weathering is . regolith. or . Soils support the growth of higher plants by providing a medium for plant roots and supplying nutrient elements that are essential to the entire plant.. Soil properties are the principal factor controlling the fate of water in the hydrologic system. Water loss, utilization, contamination and purification are all affected by the soil..