A very partial geographical problem, a master of advancement

"Mountain", which is academically defined, refers to the area where the earth's crust rises and is cut by rivers, and generally refers to highlands with large heights and steep slopes. From top to bottom, it is divided into three parts: the summit, the slope and the foothills. There can be mountain systems, mountains, peaks, etc."

"Mountain system" refers to a general term for a number of adjacent mountain ranges that extend in a certain direction, are related in origin, and are regularly distributed.

"Mountains" refers to a number of adjacent mountains along a certain direction and are regularly distributed. Because of its resemblance to blood, it was named "Mountain".

"Peaks" are generally fingertip-shaped peaks with a certain height, and are mostly made of rocks.

If you want to ask how to count the number of mountains, it depends on what you ask, for example, the Tianshan Mountains are a mountain system, and this mountain system is composed of many mountain ranges, such as the Bogda Mountains, Borokonu Mountains, etc., and the Bogda Mountains have many peaks, such as the highest peak of the Tianshan Mountains, Bogda Peak, and so on.

The saddle is a reference to the relatively gentle part of the terrain between the two mountains. It doesn't have to be between two peaks, it's also between two mountains.

Generally, you don't need to describe one mountain and two mountains like this, it is very vague to describe how much the concept of a mountain contains, just remember that the saddle is a kind of terrain in a gentle part between two peaks, or it can be said that between two peaks in a mountain range, the terrain of the saddle is formed.

Both of these are true.

It's hard to say the number of mountains, but there are many that are called such and such peaks, such as Mount Everest belongs to the Himalayas.

The area between the two summits is called the saddle.

Saddle is formed by two mountains.

Landslide landing is when the earth and stone on the surface of a hillside slide down as a whole. Debris flow is a destructive geological disaster of the branch chain of earth and rock and water flow along the valley to the low place, and the debris flow is essentially a flood, which is accurately called a mountain flood, but the water carries a lot of earth and rock. Landslides generally only occur on one hillside, have a small range, and do not run around.

Mudslides can cause damage on a large scale and can go down the river.

Landslides are prone to occur at ridges. However, mudslides can also form after landslides.

Landslides are the whole soil or rock mass sliding down along the sliding formwork under the action of gravity, and debris flow is a mixture of solid and water bodies, which must occur in the valley area, so the ridge is most prone to landslides.

Landslide is the mountain from the original position downward, its hazard is the Wangting hole block, the debris flow is the water sandwich banquet mixed with stones and mud from the high place to the downflow of sleepy, the hazard is strip-shaped, the ridge is most prone to landslide!