The Sahara Desert: Shifting “Sandscape”

From Ice Age grasslands to shifting sands · 流动的沙景

Hot days with temperatures soaring above 40℃, nights of extreme cold, small bands of nomadic people travelling across a barren territory with only the stars to guide them.

Welcome to the Sahara, the world’s largest hot desert, covering more than nine million square kilometres across North Africa.

The Sahara is a complex ecosystem bound by its dry, harsh climate. It is known as one of the toughest places on Earth. A mistake on the Sahara can cost you your life. People perish without water. You either carry enough water with you, or you know exactly where and how to find it.

Any area of land where the annual rainfall is less than 250 mm is officially classified as a desert. It’s the lack of water — not the sand — that makes a desert a desert. In fact, you might be surprised to learn that only 25 percent of the Sahara is covered with sand.

Although it occupies an area almost as big as Canada, the Sahara is one of the least populated places on Earth. Less than two and a half million people live there. Most of them are nomads — people with no permanent home. They are known as Bedouin, the Arabic word for “desert dwellers”.

They are mostly descendants of Arabs who migrated west from their desert kingdoms. Everything they need for survival, they carry with them.

These nomads live in small family groups and are constantly on the move. Age-old wisdom about how to live in the Sahara has been passed down from generation to generation. Often you can find Bedouin in places where water is abundant, and date trees provide shade and a welcome rest. Goats, sheep, and camels provide food and transport.

It’s hard to imagine, but the Sahara desert was once covered in ice during the last Ice Age. Thousands of years later, the ice melted, leaving fertile grasslands. Slowly, changes in the climate transformed the land from lush and tropical to the desert we know today.

The story of the Sahara is indeed the story of shifting sands.

The Sahara Desert — Shifting “Sandscape”

Hot days with temperatures s(1)__________ above 40℃, nights of extreme cold, small bands of nomadic people travelling across a b(2)__________ territory with only the stars to guide them.

Welcome to the Sahara, the world’s largest hot desert, covering more than nine million square kilometres across North Africa.

The Sahara is a c(3)__________ ecosystem bound by its dry, h(4)__________ climate. It is known as one of the toughest places on Earth. A mistake on the Sahara can cost you your life. People p(5)__________ without water. You either carry enough water with you, or you know exactly where and how to find it.

Any area of land where the annual rainfall is less than 250 mm is officially c(6)__________ as a desert. It’s the lack of water — not the sand — that makes a desert a desert. In fact, you might be surprised to learn that only 25 percent of the Sahara is covered with sand.

Although it o(7)__________ an area almost as big as Canada, the Sahara is one of the least populated places on Earth. Less than two and a half million people live there. Most of them are nomads — people with no p(8)__________ home. They are known as Bedouin, the Arabic word for “desert dwellers”.

They are mostly descendants of Arabs who migrated west from their desert kingdoms. Everything they need for survival, they carry with them.

These nomads live in small family groups and are constantly on the move. Age-old wisdom about how to live in the Sahara has been passed down from generation to generation. Often you can find Bedouin in places where water is a(9)__________, and date trees provide shade and a welcome rest. Goats, sheep, and camels provide food and transport.

It’s hard to imagine, but the Sahara desert was once covered in ice during the last Ice Age. Thousands of years later, the ice melted, leaving f(10)__________ grasslands. Slowly, changes in the climate transformed the land from lush and tropical to the desert we know today.

The story of the Sahara is indeed the story of shifting sands.

📌 重点单词 · Key Vocabulary

🔗 重点词组 · Key Phrases

💡 语法小贴士 · Grammar Tips

🏜️ 文化拓展 · The Sahara: More Than Just Sand

撒哈拉（Sahara）这个名字本身就来自阿拉伯语的"沙漠"（ṣaḥrāʾ）。它是世界上最大的热沙漠，900 多万平方公里的面积几乎与中国相当，横跨埃及、利比亚、阿尔及利亚等十余个北非国家。

文中的 Bedouin（贝都因人）是撒哈拉最著名的游牧民族："Bedouin" 在阿拉伯语中意为"沙漠住民"。他们逐水草而居，骆驼是移动的粮仓与运输工具，椰枣树提供阴凉与食物——一套延续千年的沙漠生存智慧，正面临着现代化的冲击而日渐稀少。

最颠覆常识的是最后两段：沙漠的定义看的是降水量（每年不足 250 毫米）而不是沙子；撒哈拉只有约四分之一是"沙海"，其余是砾漠、石漠与山地。而在上一个冰河时期，这片如今最干旱的土地曾被冰雪覆盖，融化后更一度是肥沃的草原。所谓 Shifting "Sandscape"，流走的不只是沙，还有沧海桑田的时间本身。