Waterfall

Waterfalls form where the river flows over a steep precipice in its course.

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Cold and warm fronts are formed where bodies of cold and warm air meet.

Solar eclipse and lunar eclipse

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The boundaries of tectonic plates can be seen on the seafloor.

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When masses of cold and warm air meet, weather fronts develop.

The desert

One third of the continents is covered with desert. Today, desertification is a...

Local winds

The most important types of local winds are the sea-land breeze, the mountain-valley...

Types of lakes

Still waters take various forms on the planet. Let’s take a look at how we can group them.

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