56 Land Under Water-High

Land Under Water FOCUS Question What does the land look like under the ocean?

水下的土地海洋下的土地是什么样子的?

A Hidden Landscape Imagine you are on a boat on the ocean. You look down into the water. The ocean is so deep, it looks as if it goes on forever. But all that water sits on top of land. This land has many shapes. It has flat areas, high places, and low spots. It's just like the land above water! Word Wise "The ocean" can mean one ocean or all five oceans on Earth. They're all connected as one body of water!

想象你在海上的一艘船上。 你往水里看。 海洋是如此之深，它看起来好像永远不会结束。 但所有的水都在陆地上。 这片土地形状各异。 它有平的地方、高的地方和低的地方。 它就像水面上的陆地!“海洋”可以指地球上的一个海洋或所有五个海洋。 它们都连接在一个水体中!

Continental Shelf A continent is a big piece of land. Most of this land is above water. But some of it, around the edges, is below the water. Have you been to the beach? When you walk into the water, you are stepping onto the continental shelf! The water is not very deep here. Sunlight reaches the ocean floor and warms the water.

大陆架大陆是一大块陆地。 大部分土地都在水面上。 但有些在边缘处，在水下。 你去过海滩吗? 当你走进水里，你就踏上了大陆架!这里的水不是很深。 阳光照射到海底，使海水变暖。

Continental Slope At first the continental shelf slopes down gently. Then the seafloor becomes steep. This steep part is the continental slope. The seafloor is now very deep. It is far below sea level. The water is cold and dark. Sunlight cannot reach this deep.

起初，大陆架平缓地向下倾斜。 然后海底变得陡峭。 这陡峭的部分是大陆斜坡。 海底现在非常深。 它远低于海平面。 水又冷又黑。 阳光照不到这么深。

Deep-Ocean Floor At the bottom of the continental slope is the deep-ocean floor. Tiny pieces of sand and rock sink down and land on the continental slope. Then the sand and rock slide down the slope. They pile up on the deep-ocean floor. Over time, a thick layer of sand and rock builds up. Do You Know? An abyss is a very deep place. Most of the deep-ocean floor is called the abyssal plain.

深海海底大陆斜坡的底部是深海海底。 小块的沙子和岩石下沉，落在大陆斜坡上。 然后沙子和岩石顺着斜坡滑下来。 它们堆积在深海海底。 随着时间的推移，形成了一层厚厚的沙子和岩石。 你知道吗?深渊是一个非常深的地方。 深海的大部分海底被称为深海平原。

Highs and Lows The deep-ocean floor is not always flat. There are mountains and valleys below water just like there are above water. Seamounts are mountains under the ocean. Most seamounts are too short to reach the surface. If the top of a seamount is above water, that part is called an island.

深海海底并不总是平坦的。 水下有山脉和山谷，就像水上有一样。 海山是海底的山脉。 大多数海山都太短，无法到达地表。 如果海山的顶部露出水面，那部分就叫做岛。