A medial moraine is a narrow band of rock debris which usually runs down the centre of the glacier. It forms from the merging of the lateral moraines of two glaciers and often occurs in regions that have been acted upon by a past ice age.
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The Precambrian time refers to the time 4.5 billion to 542 millions year ago. This period is characterized by having reduced atmosphere and included reduced compounds. Scientists believed that atmosphere at that time was devoid of free oxygen and CO2 was present in excess. Before the complex life evolved on the Earth, the Precambrian Earth's ocean contained dissolved carbon dioxide.
Nearly all of the energy comes from the sun
