A Desert Bigger Than China#
Do you know how big the world’s largest desert is?
The Sahara Desert covers 9.4 million square kilometers — bigger than all of China!
It stretches across 11 countries in northern Africa, from the Atlantic Ocean all the way to the Red Sea.
Standing on a sand dune in the Sahara, all you can see in every direction is golden sand, stretching to the horizon like a golden sea.
An Oven by Day, a Fridge by Night#
The Sahara Desert is one of the hottest places on Earth.
Daytime temperatures can reach 58°C — hot enough to fry an egg!
But at night, temperatures drop to below freezing — cold enough to form ice!
Why such a huge temperature difference? Because there’s almost no water in the desert. Water stores heat, and without it, daytime heat quickly dissipates, making nights very cold.
The Sahara Was Once an Oasis#
You might not believe it — thousands of years ago, the Sahara was actually a green grassland!
Back then, there were lakes, rivers, elephants, and crocodiles. Rock paintings show scenes of people herding cattle by the river.
Then the climate changed, rain became scarcer, and the grassland slowly turned into desert.
This tells us: Earth’s climate is always changing. Today’s great desert was once a land full of life.
Life in the Desert#
Although the Sahara looks barren, there’s actually plenty of life.
Camels are the ships of the desert — their humps store fat, allowing them to go days without water.
Desert foxes have big ears — not to look cute, but to release heat.
Some plants have seeds that can stay dormant in the sand for years, then quickly sprout, bloom, and produce seeds when it rains, before “disappearing” again.
Learn from the World#
The Sahara teaches us one thing: environments change, but life always finds a way.
From oasis to desert, the Sahara has undergone enormous changes. But even in the harshest conditions, life still stubbornly survives.
Maybe that’s what’s amazing about life — no matter how tough the environment, it always adapts and always finds a way to live.
Knowledge Card#
- Location: Northern Africa, spanning 11 countries
- Type: Natural Wonder
- Key Numbers: 9.4 million sq km, maximum daytime temperature 58°C
- Science: Deserts lack moisture to store heat, causing extreme temperature differences between day and night
- Fun Fact: The Sahara Desert expands southward by about 48 kilometers every year
- Source: National Geographic