Question

How can we measure vast distance such as depth of ocean or diameter of earth?

Answer 1

Explanation:

Using those measurements, the equatorial circumference of Earth is about 24,901 miles (40,075 km). However, from pole-to-pole — the meridional circumference — Earth is only 24,860 miles (40,008 km) around. This shape, caused by the flattening at the poles, is called an oblate spheroid

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Answer 2

Answer:

Echolocation

Explanation:

The most common and fastest way of measuring ocean depth uses sound. Ships using a technology called sonar, which stands for sound navigation and ranging, can map the topography of the ocean floor. The device sends sound waves to the bottom of the ocean and measures how long it takes for an echo to return.