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Natural sciences

Grade 4

Planet earth and the universe

Module 47

Talking about the oceans

Activity:

Talking about the oceans and their significance for people

[LO 1.2]

Water covers about 70% of the surface of the earth. The three largest oceans on the earth are the Pacific, the Atlantic and the Indian oceans.

Answer the following questions:

1. What is the name of the largest ocean?

2. Which two oceans border South Africa?

3. Why do we say that the sea is a resource for humankind?

4. What other products come from the sea?

5. What sports are practiced on the sea?

Where do animals live in such cold areas?

Animals live on the land or in the water.

Seals swim under the icecaps. They have a thick layer of fat, called blubber, under their skin, which keeps them warm.

Their food:

Millions of tiny creatures that look like shrimps and are called animal plankton live in the icy seas. Fish, seals, whales and seabirds eat these.

Assessment

LEARNING OUTCOME 1 : SCIENTIFIC INVESTIGATIONS The learner will be able to act confidently on curiosity about natural phenomena, and to investigate relationships and solve problems in scientific, technological and environmental contexts.

Assessment Standard

We know this when the learner

1.2 leads investigations and collects data.

Memorandum

Oceans

1. Pacific Ocean

2. Atlantic and Indian Oceans

  1. There are fish, sharks, whales and other marine animals that are edible to man. Many other things are made from shells and sea plants.
  2. Diamonds, gas, coal and oil
  3. Regattas, skiing, boat races, angling, kayaking, swimming, etc.

Questions & Answers

a perfect square v²+2v+_
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. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
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At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
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the Beer law works very well for dilute solutions but fails for very high concentrations. why?
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Source:  OpenStax, Natural sciences grade 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11096/1.1
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