Grade 8 Water Systems Task

Knowledge and Understanding:

1. a) What are tides?  What causes a high or low tide?

    b) How often to high tides and low tides occur?  What is a tide table and what benefit is it?

    c) What are the largest and smallest tidal movements called?  Explain why/how each occurs.

2. a) What are estuaries and how are they affected by the tides?

3. How are estuaries important to nature? (Environmental)

4. How are estuaries important to people on earth? (Economics)

One world:

Give an example of a particular estuary

�  Give examples of how science and technology can have a negative effect on estuaries

�  Give examples of how science and technology can ensure estuaries remain intact

�  Explain how this science and technology positively affects people, societies and the environment.

�  Explain how this science and technology negatively affects people, societies and the environment.

�  Explain clearly one of the economic and one of the environmental issues that influence people to use the science and technology that affects estuaries.