Chapter 14 Notes – Weathering and Erosion Constructive Forces/Processes – forces or processes that add-to or create __________ land features to the landscape. Destructive Forces/Processes – forces or processes that take-away or break ________ land features from the landscape. Weathering – is the process of breaking down rock and minerals into _________________ pieces. • The smaller, loose ___________ are called sediment. • Sand, Silt, & Clay are used to describe specific types of sediment. Mechanical weathering - occurs when forces ______________ or chip rocks and minerals into smaller pieces without changing their composition o Wet/Dry Conditions o Running Water o Frost Wedging o Animals o Plants o Wind – abrasion Chemical weathering – occurs when chemical reactions between ____________ and rock/mineral grains break rock/minerals into smaller pieces. o Pollution (Acid Rain) o Plants o Animals Erosion is the process of moving pieces of rock and _____________ by wind, water, ice, or gravity Gravity is the force of attraction that _______________ all objects toward Earth’s center/core. Other causes of erosion, also called agents of erosion, are ___________, wind, and glaciers. The process of depositing sediment after it has been _______________ by water, wind, or ice is called deposition. A large mass of ice and snow moving on ____________ under is won weight is called a glacier. Wind can move particles of sediment from one ____________ to another called deflation. Mass wasting/Mass Movement is the downhill movement of ____________ amounts of rock and sediment due to the force of gravity. Erosion by rivers is an important ____________of why land looks the way it does at any given time.