The blue planet--Earth
Seen from space, our earth, with water covering 70% of its surface, appears as the beautiful " blue planet". The bare land areas appear red or brown, dark green shows where there is plant cover, and the white means snow. Besides the seven major land areas, called continents, there are thousands of islands. Some of these are arranged in groups and some stand alone in the great oceans.
Arms of land which reach out into the water are called peninsulas(半岛); seas, gulfs and bays are armes of the ocean which lie beteen islands and peninsulas. A narrow piece of land connecting two larger land areas is an isthmus(地峡); a narrow streth of water beteen two land areas is called a strait or a channel.
Water is constantly in motion on the earth. Rain water runs off the mountains into valleys; it collects in lakes and rivers which carry it back to the seas. From the high altitudes of mountain passes and plateaus to the canyons and low-lying planis, the features of the land are wonderful to see.
Arms of land which reach out into the water are called peninsulas(半岛); seas, gulfs and bays are armes of the ocean which lie beteen islands and peninsulas. A narrow piece of land connecting two larger land areas is an isthmus(地峡); a narrow streth of water beteen two land areas is called a strait or a channel.
Water is constantly in motion on the earth. Rain water runs off the mountains into valleys; it collects in lakes and rivers which carry it back to the seas. From the high altitudes of mountain passes and plateaus to the canyons and low-lying planis, the features of the land are wonderful to see.
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