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I

The rock tends to split or part along these planes of weakness.

Where plates pull apart and new oceanic crust is formed ...

Evidently, North America and Gondwanaland were together 1.15 billion years ago, but split (or rifted) apart (or separated) shortly thereafter.

Constituents having different densities separate under the influence of gravity.

II

The container is within the jacket, the two being separated by a 1 -cm air space.

The stream is split at B.

Источник: Русско-английский научно-технический словарь на Gufo.me