Номер 2, страница 138 - гдз по английскому языку 9 класс учебник Комарова, Ларионова

Extra contents. 5. Science - номер 2, страница 138.

Условие.

2 Read the text and say which of the diagrams represents:

a) when very high tides occur

b) when very low tides occur

Gravity and its effects on the tides

The Earth orbits the Sun approximately every 365 days and the Moon orbits the Earth approximately every 27 days. It is gravity which keeps the Earth and Moon in their orbits, but gravity is also what affects the tides.

Although the Sun’s gravity is much stronger than the gravitational force of the Moon, in fact, it is the Moon which has the greater effect on the Earth’s tides because it is nearer to the Earth. But both the Sun and Moon affect the tides.

Water in the oceans on Earth is ‘pulled’ into different tide patterns by gravity.

When the gravity of the Moon and Sun are on the same axis, there will be high tides (diagrams 1 and 3). When the Moon and Sun are perpendicular, the tides are very low (diagram 2).

Analysis of ocean movements and tides is very complex because oceans vary in depth and shape and every coastline around the world is unique. This means that some places have two tides a day and some only one, while other places have no visible tide at all.

When bad weather and storms combine with high tides, flooding often takes place.

1 EARTH MOON SUN

2 EARTH MOON SUN

3 EARTH MOON SUN

Решение 1.

Решение 2.