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 .