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Running east to west between Weston-super-Mare and Frome , the hills overlook the Somerset Levels to the south and the Chew Valley and other tributaries of the Avon to the north. The hills give their name to the local government district of Mendip , which administers most of the area. The hills are largely formed from Carboniferous Limestone , which is quarried at several sites. Three nationally important semi-natural habitats are characteristic of the area: ash — maple woodland, calcareous grassland and mesotrophic grassland.
The accumulation of cosmogenic chlorine-36 in rocks: a method for surface exposure dating.
Stonehenge and the Ice Age: Those famous Chlorine 36 dates - Chlorine 36 rock exposure dating sites
See Current status. Testing of components also began in late , including Aerojet 's monopropellant engine with the ability to throttle from 15— percent thrust with a fixed propellant inlet pressure. The name had been submitted in an essay contest by Clara Ma, a then sixth-grader from Kansas. A fourth landing site workshop was held in late September ,  and the fifth and final workshop May 16—18, On December 13, , the rover began monitoring space radiation to aid in planning for future manned missions to Mars. The interplanetary journey to Mars took more than eight months,  time during which, the spacecraft performed four trajectory corrections: on January 11, March 26, June 26 and on July Mission design had allowed for a maximum of 6 trajectory correction opportunities.
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