Mary Douglas Leakey was recognized in her lifetime as one of the world’s most distinguished fossil hunters. In 1974 Mary BEGINS work at Laetoli, 30 miles from Olduvai Gorge. It is here that Mary and her team found amazingly well preserved hominid footprints in volcanic beds, known as tuffs. The footprint tuff of 1976 has a potassium argon date of 3.5-3.8 mya, evidence of upright walking that supported Donald Johansen's find, Lucy, also known as Australopithecus Afarensis, though Mary Leakey has rejected this( she believe that the belong to the genus homo). Eighty feet of trail had been uncovered by 1979, leaving researchers to speculate that it was three hominids, possibly a family, that left their mark millions of years ago.
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Answer:
B. Underground water close to the surface of the land
Explanation:
The water table is the underground dividing line between the unsaturated zone in the upper layer and the saturated zone in the lower layer. The unsaturated zone is the soil surface and zone of aeration where oxygen and water permeate through the soil. The saturated zone is composed of hard rock. When water precipitates from the soil, the result is the groundwater found below the water table.
Groundwater overflows as springs into water bodies at the point where the land surface converges with the water table. Therefore, regions with high table water will have their underground water close to the land surface.
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