第十九课

19 ocean and land19海洋和陆地

We often say that the earth is a water ball. How is the water distributed on the earth?我们常说地球是一个水球，地球上的水是怎样分布的?

Activity process活动过程

Know the globe.●认识地球仪。

This is the equator. North of the equator is这是赤道，赤道以北是.....

index card for files资料卡

In order to understand the earth, people have made a model of the earth, the globe, according to a certain scale.人们为了便于认识地球，按照一定的比例缩小，制作了地球的模型-地球仪。

There is a line on the globe representing the equator, which is the dividing line between the southern and northern hemispheres.地球仪上有一条表示赤道的线，赤道是南、北半球的分界线。

Understand the ocean and land,●认识海洋和陆地，

The blue part represents the ocean.蓝色部分表示海洋。

I found land我发现陆地....

These islands这些岛...

index card for files资料卡

Land is the part of the earth's surface that is not submerged by sea water, including continents and islands. Ocean is the general name of the sea and Ocean on the earth's surface.陆地是地球表面未被海水淹没的部分，包括大陆和岛屿等海洋是地球表面连成一体的海和洋的统称。

How are the oceans and land distributed?●海洋和陆地是怎样分布的?

According to the information found,根据查找的资料，

The northern hemisphere is smaller than the southern hemisphereI find.....北半球比南半球的陆地.....

I find.....我发现.....

What is the area of ocean and land?海洋与陆地的面积各是多少?

Let's look up the information.我们来查阅资料。

Land area (10000 square kilometers)陆地面积(万平方千米)

Sea area (10000 square kilometers)海洋面积(万平方千米)

Land name Eurasian continent陆地名称亚欧大陆

African continent非洲大陆

North American continent北美大陆

South American continent南美大陆

Continental Australia, Antarctica南极大陆澳

The continent of Australia大利亚大陆

Ocean name海洋名称

the pacific ocean太平洋

Atlantic大西洋

the indian ocean印度洋

arctic ocean北冰洋

According to the data, we compare the land and sea area by using the method of grid.我们根据资料用涂格子的方式比较海陆面积。

A lattice represents一个格子代表.....

Most of the earth's surface is covered by the ocean, which accounts for about 7 / 10 of the total area of the earth, and the land area accounts for about 3 / 10 of the total area of the earth.地球表面大部分被海洋覆盖，海洋面积约占地球总面积的7/10，陆地面积约占地球总面积的3/10。

land陆地

ocean海洋

Development activities拓展活动

Make models of ocean and land distribution.制作海洋和陆地分布的模型。