1. How are whirl pools formed?
Basically, a whirl pool is a swirling body of water produced by the meeting of opposing currents.
If you are referring to the whirlpools in the oceans, they are usually caused by tides. However small ones can also be formed by other movements of water eg base of water falls where there is a narrow and shallow strait of fast flowing water.
2. What happens to the oceanic crust that has subducted underneath the continental crust?
The denser (heavier) oceanic plate sinks under the continental plate, and it will melt and turn into magma. The magma then rises upwards towards the earths surface, and is released through volcanic eruption. It is then called lava, which is what we see during an eruption.
Admin matters
1. Students that have dental appt (18 Sept) - a few of you left earlier for dental during the lesson. I went through the diagrams of the 3 types of plate movement (convergent, divergent and transform). Pls borrow your classmates worksheet and fill it in.
2. Homework : To complete worksheet on vulcancity by Thursday 20 Sept!
3. File check: I will browse through your files on 25th Sept
4. Lesson venue: Pls assemble at the Xinnovate on the 25th Sept (Tues)
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