Hint: They slowly deform and flow under stress caused by their weight. They develop only on land and are quite different from the much thinner sea ice and lake ice that usually form on the surface of the bodies of water. They are the biggest source of freshwater in the world. Complete answer: Pulse is a type of legume crop, but the term pulse refers to the dried seed. Examples of pulses include A glacier is a long-lasting body of thick ice that is continuously shifting under its own weight. A glacier is formed when snow accumulation exceeds its ablation for several years, often centuries. They strip rock and debris from their substrate to create landforms such as cirques and moraines. On Earth, 99 percent of glacial ice is located within massive ice sheets that are also known as "continental glaciers" in polar regions, but glaciers can be found in mountain ranges on all continents other than the Australian mainland, including high-latitude oceanic islands such as New Zealand. Glaciers cover about 10% of Earth's surface area. Greenland and Patagonia also have vast expanses of continental glaciers. The number of glaciers, not including the ice sheets of Antarctica and Greenland, was measured at 170,000 km3. Following are the given alternatives:- A glacier can be understood as a huge mass of ice and snow that moves slowly over land. Thus, Option A is correct. Any accumulation of unconsolidated debris, also referred to as glacial till, that occurs in both present and formerly glacial areas, and that has previously been carried along by a glacier or ice sheet is referred to as a moraine. Thus, Option B is incorrect. Magma is a molten or semi-molten natural material from which all igneous rocks are produced. Magma is located below the surface of the Earth. Thus, Option C is also incorrect. Lava is a molten rock i.e. magma which has been ejected from the interior of a terrestrial planet like the Earth or a moon. Magma is caused by the internal heat of the earth or moon and erupts as a lava in volcanoes or by cracks in the crust. Volcanic rock resulting from subsequent cooling is most frequently referred to as lava. Thus, Option D is also incorrect. Therefore, the right answer is Option A. Note: Pakistan has more ice than any other country outside the polar regions with more than 7,000 known glaciers. A large piece of compressed ice, or glacier, appears blue, with large amounts of water appearing blue. This is because water molecules absorb colours other than blue more effectively. Another explanation for the blue colour of glaciers is the absence of air bubbles. As the size of the glacier shrinks below the critical point, the flow ceases and becomes stagnant. In the meantime, the meltwater within and under the ice leaves has stratified alluvial deposits. These deposits, in the form of columns, terraces and clusters, persist after the melting of the glacier and are known as "glacial deposits".