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.

• When a liquid system breaks down into two phases ...

• A single large continent (Pangaea) formed during the Proterozoic and remained as a single unit until it broke apart during ...