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• Europa (moon) — Europa Europa s trailing hemisphere in approximate natural color. The prominent crater in the lower right is Pwyll and the darker regions are areas where Europa s primarily water ice surface has a higher mineral content. Imaged on September 7,… …   Wikipedia

• CLAW hypothesis — The CLAW hypothesis proposes a feedback loop that operates between ocean ecosystems and the Earth s climateCharlson, R. J., Lovelock, J. E., Andreae, M. O. and Warren, S. G. (1987). [http://www.nature.com/nature/journal/v326/n6114/abs/326655a0.htm… …   Wikipedia

• environment — environmental, adj. environmentally, adv. /en vuy reuhn meuhnt, vuy euhrn /, n. 1. the aggregate of surrounding things, conditions, or influences; surroundings; milieu. 2. Ecol. the air, water, minerals, organisms, and all other external factors… …   Universalium

• Concrete — This article is about the construction material. For other uses, see Concrete (disambiguation). Outer view of the Roman Pantheon, still the largest unreinforced solid concrete dome.[1] …   Wikipedia

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