Download Types of Chemical Weathering

Chemical Weathering
M.Y.Li
Subject:Geography
Class:S.4B
Time:1 hour and 10 minutes
Date:6th December 2000
Objectives:At the end of the lesson, students are able to
i.
ii.
iii.
iv.
v.
know what chemical weathering is.
know the conditions favour the occurrence of chemical weathering.
know the processes of chemical weathering
identify spheroidal weathering and honeycomb
know the processes leading to the formation of spheroidal weathering and
honeycomb weathering
Teaching materials / aids:
i.
ii.
iii.
iv.
teaching notes
textbook
Power Point Slides
a rock specimen
Content
Teacher / Students' Activities
Aids
Time
-show students a weathered
1. Teach students what rock specimen to help them
chemical weathering is understand chemical
weathering.
A rock specimen
showed by a
5
visualizer and then it min.
will be passed around
- ask students questions to
2. Teach students the
guide them to understand the
conditions favour the
conditions favour the
occurrence of chemical
occurrence of chemical
weathering
weathering.
Power Point
Presentation
15
min.
-teach students the processes of Power Point
chemical weathering
Presentation
20
min.
3. Teach students the
processes of chemical
weathering
4. Teach students the
two types of chemical
weathering
5. Consolidation
-ask students questions so as to
guide them to know where and Power Point
how spheriodal weathering and Presentation
honeycomb weathering occur.
10
min.
-ask students questions so as to
guide them to understand the
Power Point
characteristics of extrusive
Presentation
igneous rocks and intrusive
igneous rocks
32
min.
-teach students how to classify
Power Point
igneous rocks according to its
Presentation
chemical composition
10
min.
-complete the multiple choice
exercises in the textbook (P.82)
8 min
-check the answers
PowerPoint presentation

Chemical Weathering

Types of Chemical Weathering