Plucking is when a glacier freezes onto a rock and pulls it away from the land as it moves. Abrasion is when the rocks (and other materials) that have been previously plucked by the glacier are carried by the glacier and is then rubbed against the sides and floor of the valley, like sandpaper. And finally, freeze-thaw weathering occurs in rocks that have many cracks and joints in them, and where temperatures are usually around freezing point. Water (from beneath the glacier), called melt water, gets into the small cracks in the day, and freezes and expands in the night. This puts pressure on the crack, and expands it wider.
When water freezes, latent heat is also released, warming the air in contact with the forming ice. Latent heat plays an important role in the redistribution of heat on the surface of Earth, especially through evaporation in the tropics and subtropics and the subsequent precipitation in higher latitudes. Secondly the warm waters sets up a low-pressure region around Iceland, reaching over the Norwegian Sea. The Icelandic Low acts as an enormous whirlpool sucking in warm air from the subtropical regions on top of the Gulf Stream and sending much of the heat to Norwegian shores. The transport of heat by the warm ocean
It means that ice particles turn into snow crystals. Other phenomena can also cause snow to fall: -riming: it is the adhesion of a super-cooled water droplet to an ice particle or snow crystal -aggregation: snowflakes are formed by the adhesion or sticking of ice and snow crystals. Here is a little diagramm which represents the different steps of natural snow formation: SNOWFALL FORMATIONWater vapor + Nucleus + T<0°C + Saturation| \/
An oxbow lake is a U-shaped body of water that forms when a wide meander from the main stream of a river is cut off, creating a free-standing body of water. They are formed when the neck of a meander has eroded and become very narrow. The fast flowing river then cuts through the meander neck during times of flooding. Deposition then cuts off the old river, creating a straight channel. The creation of an oxbow lake is due to flood events and also processes of erosion such as hydraulic action.
The release of heat from Earth's interior creates huge convection cells, which are at least partly responsible for driving plate motion. Convection brings hot rock up from deep in the mantle and recycles cold rock back into the mantle. Many unanswered questions
These P waves are able to travel through both solid rock, such as granite mountains, and liquid material, such as volcanic magma or the water of the oceans. The slower wave through the body of rock is called the secondary or S wave. As an S wave propagates, it shears the rock sideways at right angles to the direction of travel. If a liquid is sheared sideways or twisted, it will not spring back, hence S waves cannot propagate in the liquid parts of the earth, such as oceans and lakes. The actual speed of P and S seismic waves depends on the density and elastic properties of the rocks and soil through which they pass.
Warm air can also rise to form clouds, and blizzard snows, as it drifts up a mountainside. Blizzards can cause power outages and make temperatures inside of homes drop dangerously low. Strong winds combined with a temperature just below freezing create a miserable chill factor. A chill factor is what the human body ‘’feels’’ rather than what the actual temperature is. This dangerous condition can result in frostbite or hypothermia, which can be deadly.
As a result of glaciers tends to float toward the outside using the pressure of its own weight. The process of this advancement is called glaciations. Glaciers also help us maintain our water supply as well as the ocean’s level variation. Glaciers also enlarge and are reduced, depending on the changes in our weather. Some people think the melting of the glaciers are results of global warming.
Before glaciers can move and change they first have to be developed. Glaciers are formed from the process of snow changing from a solid to a vapor without melting and fall onto a surface which is most the time already a glacier surface (Murck et al., 2008). This snow then becomes compacted as time goes by and more and more snow ends up falling which leads to the snow becoming glacier ice. As for deserts, a common geological feature is a sand dune (Murck et al., 2008). Sand dunes are mainly hills or ridges made up of sand deposited by wind.
Salt melts ice, and researchers are studying this to find out why. Because of earlier studies, researchers believe that salt does truly melt ice, and it is not just a myth. If these amounts of salt are placed on ice: no salt, 5 mL, 10 mL, 15 mL, 20 mL, and 25 mL, then the ice cube with 25 mL of salt on it will make the ice melt most. Salt as a deicer is a very curious topic, but there is a science behind it. Science Concepts One of the science concepts is the melting point.