Topic: What is the corrasion?

Target group

A student of the 1st class of high school or technical school.

Program basis

General requirements

II. Skills and application of knowledge in practice.

3. Identifying the relationship between individual elements of the geographical environment (natural, socio‑economic and cultural).

Specific requirements

V. Litosphere: relationship between the interior structure of the Earth and the tectonics of lithosphere plates, internal and external processes shaping the Earth's surface and their effects, rocks.

Student:

3) characterizes the main external processes modeling the Earth's surface (erosion, transport, accumulation) and the effects of the sculptural activity of rivers, wind, glaciers, glacier and seas, and weathering.

General aim of education

The student will get acquainted with the notion of corrasion

Key competences

• communication in foreign languages;

• digital competence;

• learning to learn.

Criteria for success
The student will learn:

• explain the concept of corrasion;

• give examples of landform forms created as a result of the operation of the country;

• explain the mechanism of formation of a selected form of relief in the process of corrasion.

Methods/techniques

• expository

  • lecture.

• activating

  • discussion.

• exposing

  • exposition.

• programmed

  • with computer;

  • with e‑textbook.

• practical

  • exercices concerned.

Forms of work

• individual activity;

• activity in pairs;

• activity in groups;

• collective activity.

Teaching aids

• e‑textbook;

• interactive whiteboard, tablets/computers;

• multimedia resources contained in the lesson „What is corrasion?” in the e‑textbook;.

Lesson plan overview

Before classes

• Students get acquainted with the content of the abstract. They prepare to work on the lesson in such a way to be able to summarize the material read in their own words and solve the tasks themselves.

Introduction

• The teacher explains the aim and planned course of the lesson. They explain the success criteria to be achieved by the students.

• The teacher writes the topic of classes on the blackboard or interactive whiteboard. Students write it in notebooks..

• The instructor recommends students to familiarize themselves with the topic „What is the corrasion?” In the e‑textbook. Then it indicates the student who will discuss the topic. If necessary, the teacher complements his statement.

Realization

• The teacher presents to the students a gallery illustrating the emergence of selected forms of relief. Then he divides the class into groups and recommends that each group find on the internet two examples of pictures showing rock mushrooms, water boots and rock ridges (jardangi).

• The groups successively present one example of the aforementioned forms of relief, explaining how they were formed in the process of cor- rion. After completing this part, each group presents the remaining photos to the class, asking them to assign each of them to the appropriate form. The group that gets the first job correctly gets one point. The group that obtains the most points can, as a reward, ask the teacher three questions extending the topic of the lesson.

• Working individually, students solve interactive exercises from the abstract.

Summary

• The teacher goes on to summarize the lesson, during which the students can discuss any unclear issues and complete the notes.

The following terms and recordings will be used during this lesson

Terms

Texts and recordings

What is corrasion?

Depending on its speed, the wind can carry larger or smaller grains of sand and dust. It can hit rocks with these grains, thus slowly grinding, grooving, smoothing, or scratching them. Such a process is called corrasion. The closer to the Earth’s surface, the more sand is carried by the wind, making the corrasion process more intense. As a result, rocks protruding above the surface of the desert suffer the greatest damage to their lower part. As a result, various, sometimes very fancy, rock formations are created. The rocks that have a larger diameter in the upper part than in the lower part are called mushroom rocks.

Apart from the formation of mushroom rocks, corrasion contributes to the creation of many other landforms, e.g.,

• eolian grooves which can have a length of even hundreds of meters and a depth ranging from a few centimeters to a few meters;

• eolian polishes – forms with large, extremely smooth surfaces;

• rock ridges – also called yardangs, in the form of narrow but steep rocky ribs separated by grooves;

• ventifacts – rock fragments that have been polished by the sand carried by the wind

Examples of landforms - gallery