Natural Sciences and Technology Grade 5-B ... - Thunderbolt Kids

The bread has acrust, but no core. The apple has apeel or
skin and acore, but the core is not one solid thing. The
avocado has atough skin or peel, and asolid core, so it is
quite a good model of the Earth.
5. Although the model you chose is most like the Earth, it is not
exactly the same. In what way is this model not like the Earth?
For example, the avocado pip is not hot, but the core of the
earth is very hot.
Soil, air, water and sunlight support life on Earth
Life on Earth exists on the very thin layer around the planet -the
crust. The soil is athin layer and all the plants need soil to grow in.
The plants use energy from the Sun to grow and they make the
oxygen we and all the animals need to breathe. You already learnt
about this in Life and Living.
ACTIVITY: So what is under our feet?
INSTRUCTIONS:
1. In the first activity at the beginning of this Chapter you drew
pictures of yourself digging ahole into the Earth. You had to
imagine you were making the hole as deep as ahole can be.
2. Perhaps you feel your picture is correct, or perhaps you want
to change your idea about the Earth.
3. Look at those pictures now, and do the activity again.
QUESTIONS:
1. If you could make a hole into the Earth, through the floor of
your classroom, what would you find down in the Earth?
2. Imagine you have that machine that can dig as deep as you
want. You drive this digging machine as far as it can go. What
do you find?
3. Do anew drawing of yourself and the digging machine and
the hole. Your drawing must show the hole that the machine
makes if you let it go on until it cannot go further.
Chapter 2. Surface of the Earth
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