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1. what (happen)if there is another catastrophe like the jne at Chernol?
2. Many species of animals (disappear) now.
3. the cloyds ( protect) the Earth from the Sun.
4. Geologists (find) a large mineral deposit last month.
5/ A few minerals,such as quartz, (be) stable under quite a range of conditions.
6. Aluminum cans (be) one of the first widely recycled consumer products in the USA
7. World climatic patters constantly (change)
8. Seismologists long (recognize) a difficuity in accounting for deep earthquakes