WEATHERING, SOIL, AND EROSION 12.3 Mass Movement and Erosion
KNOWmass movement slumperosion earthflowtalus mudflowlandslide volcanic neckcreep
UNDERSTANDMass movements and erosion carry away weatheredmaterials and reshape Earth’s surface.
DOGive examples of mass movement.Explain how erosion reshapes Earth’s surface.
Ocean waves and Earthflow currents Rivers and Mudflow streams Glaciers Slump Creep WindAgents of erosion Types of landslides
EXPLAIN IN TWO OR THREE SENTENCESHOW CLIMATE AND ROCK COMPOSITIONAFFECT RATES OF EROSION. Because water is a powerful agent of erosion, regions with humid climates tend to have rounded (more eroded) topography. Some types of rock tend to weather easily, whereas others, such as igneous rock, tend to resist weathering agents.
BRIEFLY DEFINE EACH TYPE OFLANDSLIDE YOU NAMED IN THEGRAPHIC ORGANIZER ABOVE. Creep: a slow movement of soil down a slope Slump: the movement of blocks of land downward along a sloping surface. Mudflow: the rapid movement of large amounts of clay and silt suspended in water. Earthflow: the slow movement of weathered material saturated with water.
12.3 #1. EXPLAIN WHAT THE TERMMASS MOVEMENT MEANS, AND GIVESOME EXAMPLES OF MASS MOVEMENT. 12.3 #1. Mass movement is the downward transportation of weathered materials by gravity. Examples include landslides, creep, slump, earthflows, and mudflows.
#2. EXPLAIN HOW THE CLIMATE OFA REGION AFFECTS EROSION ANDTOPOGRAPHY. #2. Climate determines the types of erosion that dominate in a region, which determine the topography. In humid climates, water is an effective agent of erosion. As a result, the topography tends to be rounded. In dry regions, the topography tends to be sharp and jagged.
Bryce Canyon, Ut Garden of the Gods Colorado Springs, Co Natural Bridges, Ut
#3. VOLCANOLOGISTS OFTEN STUDY THE AREA AROUND AVOLCANO TO IDENTIFY PLACES WHERE LAHARS HAVEOCCURRED IN THE PAST. HOW COULD SUCH STUDIESBENEFIT COMMUNITIES NEAR THE VOLCANO? #3. Where lahars have occurred in the past, they may be likely to occur in the future. Thus studying lahars may help prevent deaths and future damage to communities.
#4. GRAVITY IS A FORCE THAT PULL OBJECTSDOWNWARD. FRICTION IS A FORCE THAT RESISTS THESLIDING MOTION OF ONE SURFACE AGAINST ANOTHERSURFACE. EXPLAIN HOW THESE FORCES AFFECT ROCKSAND EARTH ON A MOUNTAIN SLOPE. #4. Gravity causes mass movement of material down a mountain slope. Friction opposes gravity and thus acts to hold rocks on a mountain slope.