The document provides instructions for a learning activity on the composition and structure of the atmosphere. It outlines two sections - Section A involves writing a commentary describing a journey through the atmosphere from the perspective of an astronaut. It must include details on the layers passed through, temperature changes, radiation absorption and importance of each layer. Section B requires students to sign up for OneNote, save the commentary there and provide a snapshot on Ulink. Extra resource links are provided to gather more information for the activity.

1. Authentic task
Examined and Moderated by:
D.R DIBE
201114069

2. Activity 1
Grade: Ten
Subject: Geography
Topic: Composition and Structure
of the atmosphere

3. INTRODUCTION
The Earth’s atmosphere is a complex mixture of gases. The
atmosphere is mostly air, which is made of gas molecules. These
gas molecules in the air are nitrogen gas (78%), oxygen (21%), and
small amounts of water vapour, argon and carbon dioxide (1%).
Besides air, the atmosphere also contains tiny solid particles such
as dust and pollen. Without our atmosphere, there would be no
life on earth. Scientists divided the atmosphere into four layers
according to temperature: troposphere, stratosphere,
mesosphere, and thermosphere. The temperature drops as we go
up through the troposphere, but it rises as we move through the
next layer, the stratosphere. The farther away from earth, the
thinner the atmosphere gets.

4. Instructions
In this learning activity:
There is section A and section B
Both sections should be
completed

5. Instructions continued…
Section A
 Learners are NOT required to work together in pairs
or groups (individual work).
 The learning activity DOES REQUIRE learners to
construct knowledge by interpreting, analysing,
synthesizing, or evaluating information or ideas.
 The use of valid internet sources is allowed as an
extra resource for gathering more information
(bibliography must be included).
 This activity has to be typed (Arial 12, space 1.5).

6. Instructions continued…
Section B
 Learners are required to sign up for the
OneNote www.onenote.com/hrd.
 Save your commentary activity on
OneNote.
 This will allow for the availability for
searching as well as for sharing with others.

7. Section A

8. Activity brief
Imagine that you are an
astronaut taking a journey
through the atmosphere. Into
space. Write a commentary
describing your journey through
the atmosphere.

9. Activity brief continued…
Your commentary should include the following
information:
 The names and heights of the various layers you
will pass through
 Whether temperatures outside are increasing or
decreasing as you travel through each layer
 What radiation( if any) is absorbed by each layer
 Why is each layer important for humans and life on
earth.

10. SECTION B

11. Activity brief
Sign up for OneNote,
store the commentary activity
Attach the commentary activity
and a snap shot of their
OneNote profile on Ulink.

12. Extra information resources
 http:www.nasa.gov.mission-
pages/station/main/index.html.