3rd Grade: Take This Test On Social Studies!

Mount Everest is not the highest known mountain in the solar system. The correct answer is Olympus Mons. Olympus Mons is a volcano on Mars and is the tallest volcano and highest known mountain in the solar system. It stands at a height of about 13.6 miles (22 kilometers), which is almost three times the height of Mount Everest.

Mountains are the steepest landforms among the given options. They are characterized by their high elevation and steep slopes. Mountains are formed through tectonic activity or volcanic processes, resulting in rugged and jagged terrain. The steepness of mountains is often a result of the forces of erosion, such as glaciers and rivers, which carve deep valleys and create steep slopes. Hills, sand dunes, and plains, on the other hand, generally have gentler slopes compared to mountains.

Erosion is the most responsible for the formation of plains in third world countries. Erosion refers to the process of wearing away or moving of soil and rock materials by natural forces such as water, wind, and ice. Over time, the continuous action of erosion can lead to the flattening of land and the formation of plains. In third world countries where there may be limited resources for land management and conservation, erosion can be particularly significant in shaping the landscape.

There are four main types of plain.

A plateau is usually flat at the top. A plateau is a flat elevated landform that rises sharply on at least one side. It is characterized by its flat and level surface on the top, which is often referred to as a tableland. Plateaus are formed by geological processes such as volcanic activity, erosion, or tectonic uplift. They are commonly found in areas with rugged terrain and can vary in size from small plateaus to vast expanses of flat land. Due to their flatness, plateaus often offer excellent views and are sometimes used for agriculture or human settlements.

A scroll plain is the plain through which a river meanders in a low gradient. This type of plain is formed when a river flows through a flat or gently sloping area, creating sweeping curves or meanders. The river erodes the outer banks of the meanders and deposits sediment on the inner banks, resulting in a scroll-like pattern. Scroll plains are typically found in areas with low relief and slow-moving rivers.

A valley is not an elevated landform because it is a low-lying area between mountains or hills. Plateaus, mountains, and hills are all examples of elevated landforms, as they are higher in elevation compared to the surrounding areas. However, valleys are formed by erosion and are typically found at lower elevations, often between two higher areas.

A glacial plain is a landform created by the deposition of glacial sediments. Outwash plain and till plain are both types of glacial plains formed by the deposition of sediment carried by meltwater or pushed by the glacier. Lava plain, on the other hand, is formed by the solidification of lava flows and is not related to glacial activity. A flood plain, although it may share some similarities with glacial plains in terms of flatness, is formed by the deposition of sediment carried by rivers during flooding events and is not directly associated with glacial activity. Therefore, a flood plain is not a type of glacial plain.

The Balkan mountains are an example of fold mountains. Fold mountains are formed when two tectonic plates collide and the crust is pushed upwards, creating folds in the rock layers. The Balkan mountains are located in southeastern Europe, stretching across Bulgaria, Serbia, and Macedonia. They were formed during the collision of the Eurasian and African plates, which began around 100 million years ago. The folding and uplifting of the crust resulted in the formation of the Balkan mountains, making them a classic example of fold mountains.

Peneplains are plains caused by erosion. They are formed when the land is gradually worn down by weathering and erosion processes, such as the action of water and wind. Over time, the surface of the land becomes more level and smooth, creating a peneplain. This type of plain is characterized by its low relief and gentle slopes.