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Primary effects occur immediately, as a result of the earthquake itself. Example of primary effects include buildings and bridges collapsing and death and injury to people. Secondary effects can occur fro...

By 1950, both the USSR and the USA had successfully developed and tested nuclear weapons. For both countries, spending on research and development for more advanced nuclear weapons was a top priority, as ...

Area of a triangle = 1/2 x base x height
3 x 5 = 15cm1/2 of 15 = 7.5
Area = 7.5cm²

1. can't (can not)2) I'd (I would)3) don't (do not)4) who's (who is)5) they're (they are)

Nouns!
There are 4 different types of noun here: common, proper, collective & abstract.