Glacial period

Located in northeast Oregon is the Wallowa Mountains, which contain a rich and understudied glacial history. In order to quantify the number of glaciation stages that have occurred in this locality I will examine twelve lateral moraines that border Wallowa Lake. This beautiful lake stretches 3 and a half miles north to south with a large, bordering moraine on each side and a terminal moraine at the north end. On the west side of the lake there are four moraines and on the east there are eight.…

Evaluate the geological evidence for so-called ‘Snowball Earth’ glacial episodes in the Precambrian and the hypothesis that these episodes were critical in the evolution of complex life. Introduction The importance of this period is that multicellular evolution began to accelerate after the last glacial ended.refbookpage829.The term Snowball Earth refers to the hypothesis that in the distant past, specifically the Cryogenian period (850-630 million years ago), the earth’s surface was entirely…

Scientists remain on the search for the answer to just how much human interference has played in the recent warming period. Since the industrial revolution, scientists have discovered “that production of electricity using coal and petroleum, and other uses of fossil fuels in transportation and industry, affects our environment in ways we did not understand before.”…

the St Mary’s glacial river and feeds onto the meltwater from the St Mary’s glacier. Orthocladius is most abundant between 2 and 4 degrees as well as Microspectra. The first 2 bugs thrive when it is 2 to 4 degrees and they are most rich at site 1. At site 2, Psectrocladius is present between 6 and 8 degrees. Site 2 is situated on St Mary’s River at a height of 1100m and is located approximately 10km east of site 4. Reasons for the cooler temperatures than sites 4 and 3 is the glacial meltwater…

During ten thousand B.C. at the Northern Hemisphere, an abrupt global climate change that led to glacial like weather occured. This period is known as Younger Dryas Climate Event. Due to the earth warming, the ice age starting melting. This huge amount of freshwater started flowing into the gulf through the Mississippi River and also to north Atlantic from the east coast. This unusual flow of freshwater into the saltwater caused the water currents to change suddenly causing different weather…

timescale ranging between a few years to several decades” however the same source also describes what a glacial surge is defining it as “a cyclic phenomenon which are not directly triggered by external events, but instead result from internally driven oscillations in conditions at the bed…

path it causes longer and colder seasons, and vice versa. The eccentricity cycle is the part of the Milankovitch forces that last 100,000 years. Obliquity refers to the tilt of the earth long its axis relative to how it is facing the sun. Heating periods are caused by the gradually leaning of the earths tilt toward 24.5 degrees from the normal 22.4 degrees along its axis, so a 2-2.5 change in degrees. The obliquity cycle refreshes every 41,000 years. Currently the earth is tilt at a 23.5 degrees…

Glaciers were once present in Minnesota thousands of years ago, and as they retreated, they left behind large amounts of glacial meltwater and various landforms still present to this day. A glacier is a massive piece of ice that completely destroys everything in its path. A glacier is formed when snow is present in a location for a long period of time, long enough to freeze all together to be conjoined into a massive chunk of ice. Glaciers are usually formed on a high elevation location. When on…

This paper will focus on the Patagonian Ice Field and how global warming is affecting the glaciers as well as the affect the glaciers have and will have on the rest of the world. To begin I first must explain what a glacier is. A glacier is an immense field or stream of ice, formed in the region of continual snow, and moving slowly down a mountain slope or valley, as in the Alps, or over a large surface area, as in Greenland. They are formed over many years when snow is incessantly compressed…

all over the world. Most importantly there has been a focus on Greenland with respect to its glaciers and their impact on sea-level rise. It has been found in several studies that Greenland is seeing faster than typical rates of warming and thus glacial melting than most any other place on earth (Bekryaev, 2010). Given the significant volume of ice held within glaciers on Greenland, there is a hugely significant volume of water that should be concerning for the population the world over should…