Chemical Weathering

Chemical Weathering

You should know and understand the following terms:


Frost wedging




Root wedging

Chemical Weathering


Salt crystal growth

Debris flow

Mass wasting

Soil creep


Mechanical (Physical)Weathering





Frost heaving



After successfully completing this module, you should be able to accomplish the following tasks:

· Identify erosional processes and features created by weathering and mass wasting

· Identify depositional processes and features created by weathering and mass wasting

· Examine the processes that create mass wasting landforms

· Distinguish different weathering and mass wasting types

· Calculate slope

· Interpret the topographic profile of a landscape


This module examines weathering and mass wasting. Topics includephysical weathering, chemical weathering, and mass wasting. While these topics may appear to be disparate, you will learn how they are inherently related.The modules start with four opening topics, or vignettes, which are found in the accompanying Google Earth file. These vignettes introduce basic concepts of the weathering and mass wasting. Some of the vignettes have animations, videos, or short articles that will provide another perspective or visual explanation for the topic at hand.After reading the vignette and associated links, answer the following questions. Please note that some links might take a while to download based on your Internet speed.

Expandthe INTRODUCTION folder and then check Topic 1: Introduction.

Read Topic 1:Introduction

Question 1: According to the website, which of the following factors influence the speed of landslides? (Check all that apply).

A. Slope of ground

B. Water content

C. Volume of debris

D. Time since last landslide

Read Topic 2: Weathering

Question 2: Other than the rock material, what are the two most important factors in chemical weathering?

A. Water and slope of land

B. Debris type and water

C. Slope of land and temperature

D. Water and temperature

Read Topic 3: Mass Wasting

Question 3: What does the presence of lichen on boulders tell scientists?

A. It tells us the parent material of the debris

B. It tells us the relative time of a mass wasting event

C. It tells us what the slope of the land used to be

D. It tells us what the moisture content was at the time of the mass wasting event.

Read Topic 4: Human Interaction

Question 4: What are the characteristics of areas generally considered to be safe from landslides? (Check all that apply)

A. On flat areas away from slopes

B. On hard, non-jointed bedrock that has not moved in the past

C. At the base of minor drainage hollows

D. At the top or along the nose of ridges, set back from the tops of slopes

Collapse and uncheck the INTRODUCTIONfolder.


Figure 1.The geography of weathering (Arbogast 2nd Ed.).

Double-click and selectGLOBAL PERSPECTIVE.

Figure 1 is a graph showing the dominant type of weathering based on annual precipitation and temperature. If a location has a mean annual temperature of 20°C and receives 190cm of precipitation yearly, you can plot these values (as denoted by the star) to see this location’s dominant weathering is strong chemical.

For Questions 5 to 8, type the location information provided into the Searchtab in Google Earth and pressEnter. When you arrive at your destination, use the chart in Figure 1, in conjunction with Google Earth, to answer each question. The mean annual temperature and precipitation are provided respectively, in the parentheses.

Question 5: What is the dominant weathering In Bangkok, Thailand (28°C, 145cm)?

A. Moderate chemical

B. Strong chemical

C. Moderate chemical with frost action

D. Very slight weathering

Question 6: What is the dominant weathering in New Delhi, India (25°C, 80cm)

A. Moderate chemical

B. Strong chemical

C. Moderate chemical with frost action

D. Strong physical

Question 7: What is the dominant weathering at 19°10’21.78″N, 96° 7’59.77″W (25°C, 236cm)?

A. Moderate chemical

B. Strong chemical
The post Chemical Weathering



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