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A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z EARTHQUAKE: A disturbance within the Earth's crust or mantle (lithosphere), caused by the sudden rupture or repositioning of rocks as they release stress. The disturbance propagates outwards from the point or origin (focus) as mechanical waves. Earthquakes can be triggered by faulting or volcanic activity. EAST PACIFIC RISE (EPR): A mountain chain that is part of the Mid-Ocean Ridge. It is characterized by volcanic activity and vents that runs primarily north-south in the Pacific and rises one to 1.5 miles (1.6-2.4 km) above the ocean floor at a width of one to 2 miles (1.6-3.2 km) at an average depth of 1.7 miles (2.7 km). It abuts the North American Plate at the Gulf of California. ECOLOGY: The study of distribution and abundance of living organisms and how they interact with other organisms and their environment. ECOSYSTEM: A community of different but interdependent species and their non-living environment. ECOTONE: The zone where two ecosystems overlap, each of which supports species from both ecosystems as well as species unique to the zone. ECHO SOUNDER: A mechanism to determine depth using sound waves. Also called sonar. EELPOUT: A family of ray-finned fish. The back, tail and bottom fins have grown together to form one single long fin. Some species live in the deep ocean and can reach lengths of 1.1 m. ELECTRON IONIZATION MASS SPECTROSCOPY: A technique used to date rocks and in isotope geochemistry. ENDEAVOUR: ENZYMES: Catalysts for thousands of chemical reactions in cells. EURYTHERMAL ENZYMES: Organic catalysts that function over a wide range of temperatures. EXTREMOPHILES: Creatures that live comfortably in environments formerly considered lethal, such as those that are very hot or lack oxygen. EXTREMOZYMES: Organic catalysts from extremophiles that, unlike most known enzymes, are stable at high temperatures. A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z |
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