Oceans and seas：練習題

What approximate percentage of the Earth's surface is covered by oceans?

The Mariana Trench is known as the deepest point in the Earth's oceans. Which type of plate boundary is primarily responsible for the formation of such a deep oceanic trench?

A marine research station is located at the coordinates \( 20^{\circ} \text{S}, 150^{\circ} \text{W} \). Based on these coordinates, in which ocean is the station located, and what are the general climatic characteristics of this region?

Which geomorphological feature of the ocean floor is described as a vast, flat, sediment-covered area located on the deep seabed, often lying between the continental slope and a mid-ocean ridge?

Which feature of the ocean floor is described as a vast, flat, and sediment-covered area found at depths typically between \( 3000 \) and \( 6000 \) meters?

Identify the five major oceans of the Earth.

Distinguish between an ocean and a sea based on their size and physical relationship to landmasses.

Explain how changes in water density, influenced by temperature and salinity, drive the large-scale, deep-water movement that reinforces the concept of oceans being interconnected as a World Ocean.

(a) Identify the ocean that completely encircles the continent of Antarctica.
(b) Define the term polar and explain its application to the ocean identified in part (a).
(c) State the name of the ocean located at the highest northern latitudes, surrounding the North Pole.

(a) Explain what is meant by the term World Ocean and state the approximate percentage of the Earth's surface that is covered by oceanic water.
(b) Imagine a map where a specific marine feature is located at the coordinates \( 20^{\circ}S, 150^{\circ}W \). Define the terms latitude and longitude in the context of identifying this feature's location.
(c) State the name of the deepest known point in the oceans and provide its approximate depth in meters.