2-2-11 What is the difference between weathering and erosion?

2-9-15Aim: What is the difference between weathering and erosion?Do Now: Answer the aim question.

HW: R&H pp. 182-185, A&E #1-10Types of Weathering:1. Physical rock is physically broken into smaller sediments.2. Chemical- rock is chemically changed by reacting with different elements and weakening the rock by changing its color, texture, and chemical composition.Weathering- the breakdown of rock at the earths surface into sediments (clay, silt, sand, pebbles, cobbles, boulders1. Exposure- rocks that are exposed to air, water, and animals will weather faster.2. Particle size- smaller particles have greater surface area exposed to weathering making them break down at a faster rate.3. Mineral composition- harder minerals weather slower than softer minerals.4. Climate- Hot and humid climates favor chemical weathering and less humid with varying temperatures above and below freezing favor physical weathering.** You can have physical weathering without having chemical weathering but you cant have chemical weathering without also having physical weathering.Factors that affect the rate of weathering.Rock is broken down by physical weathering and then biologic activity will chemically change the rock and add nutrients to create soil.Over time a very immature soil will become mature by developing rich soil horizons. Soil Formation- soil is made from weathered rock and biologic activitySteps to soil formation

Do Now:1. What is the difference between chemical and physical weathering?2. If rocks are just physically weathered for a long period of time what will they turn in to?3. What is the underlying force to all agents of erosion?

HW: Work on books2-10-15Aim: How is soil formed?Cover Page with catchy title and graphic.Table of Contents.Weathering defined.Physical Weathering/Mechanical Weathering defined.- 5 picture examples with explanations.Chemical Weathering defined.- 5 picture examples with explanations.Erosion defined- 5 picture examples with explanations.Steps to soil formation pictures with explanations.Soil Horizons picture with all labels and explanations.Weathering BookDo Now:1. List the 5 agents of erosion.2.Which agent of erosion can carry the largest sediment and why?3. Which agent of erosion can carry the smallest sediment and why?

HW- R&H pp.187-194, A&E #11-29Study for Topic 9 quiz Wednesday.2-24-14Aim: What is the life cycle of a stream?8Do Now:1. What is soil made up of?2. List the things that would increase the velocity of a river.3. Why does the wind not erode things at higher levels?4. On what side of a meander does erosion occur and why?5. If a stream slows from 100 cm/s to 1 cm/s what particles would drop out? Use RT p.6

HW: Study Topic 9 for quiz Wednesday.2-25-14How do wind and glaciers erode?A streams ability to carry sediment is based on its velocity. This is called carrying power.The amount of sediment a stream is carrying is called the stream load.Floatation- particles can float on top of a stream(move slower than stream).Suspension-particles carried within a stream(move slower than stream).Solution- particles dissolved in a stream (move at the same speed as the stream).Bouncing and rolling- particles move along the stream bed and move slower than the stream.How does a stream carry its sediment.Do Now:1. What is the difference between a river valley and a glacial valley?2. As a stream matures, what happens to slope, velocity, carrying power, load, erosion and deposition?3. What is the formula for soil formation?4. What is the difference between residual and transported soil? P.1855. What are the 3 factors that affect stream velocity, p.188-189?HW Study all of Topic 9 for quiz tomorrow!

2-24-15What happens to sediments during erosion?Erosion will make sediments smaller and will change their appearance1. Running water will round and smooth particles.2. Wind will frost and pit particles as well as round them.3. Gravity will break particles leaving them sharp and angular.Glaciers will sub round particles leaving parallel grooves, striations(parallel scratches), and polishing particles.

What does erosion do to sediments?

Weathering and ErosionVideo