Heating, cooling and magnetism

Today we're going to be working on the topics that we will continue with after half term - heating, cooling and magnetism. Answer the following in your books.

1. Watch this animation. What are the three ways that heat can be transferred?
2. Give three examples of conduction:
3. Which three metals can be used to make magnets?
4. How are magnets different to normal objects? Use this picture to help you explain:

   

   A magnet on the left, a non magnet on the right.

5. What is an electromagnet? Describe one and draw a diagram:
6. Watch this video, and explain where electromagnets can be useful:
7. Complete this sentence - 'Substances get ...............when they are heated and.................when they are cooled.'
8. Explain what happens to particles when they heat up. What problems can this cause with large objects like bridges?
9. Describe shrink fitting:
10. Try and finish this challenge!
11. Try this activity. What charges attract each other? Which ones repel?
12. One more activity if you finish early.....

Rocks and weathering revision

Today we will be starting to revise for the tes on rocks and weathering next week. Answer the following in your books:

1. What does limestone look like?
2. Using the link above, what sort of rock is it? (metamorphic, sedimentary or igneous?)
3. Explain one problem associated with building things out of limestone:
4. What will this lava form when it cools down?
5. What influences the size of crystals in a rock formed this way?
6. What is metamorphic rock?
7. Watch this animation ( http://www.bbc.co.uk/bitesize/ks3/science/environment_earth_universe/rock_cycle/activity/ ), and explain what you can often find buried in sedimentary rock:
8. Try this quiz, which is fairly similar to the questions you'll have on the test next week:
9. Use the rock cycle to explain how a sedimentary rock could become a metamprohic rock:
10. How would you describe weathering and erosion? Give two ways a rock can be eroded:
11. Try this quiz (it's pretty hard so don't worry if you get some wrong!).
12. Last of all, try and find out what coccolithophores are and what part or Britain they helped create.  There's an achievement point for anyone wo can do this!