Question

high configuration of coastline help in the ocean currents

Answer 1

Oceans are nature's gift; they cover 71% of the earth's surface and contain 96.5% water. Currents and tides are the two major forces of the ocean. In layman terms, currents are those that move left to right, whereas tides are those that move up and down.
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Answer 2

The coast, also known as the coastline or seashore, is defined as the area where land meets the sea or ocean, or as a line that forms the boundary between the land and the ocean or a lake. Around 620,000 kilometres of coastline are on Earth.