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São Francisco

(Encyclopedia)São Francisco souN frəsēshˈko͝o [key], river, c.1,800 mi (2,900 km) long, rising in the Serra de Canastra, SW Minas Gerais state, Brazil, and flowing northeast, then southeast through the sertão...

flight

(Encyclopedia)CE5 Aircraft motions and control surfaces: Yaw, or motion to the left or right, is controlled by the rudder. Pitch, or climbing or dropping, is controlled by the elevators, which move in the same d...

erosion

(Encyclopedia)erosion ĭrōˈzhən [key], general term for the processes by which the surface of the earth is constantly being worn away. The principal agents are gravity, running water, near-shore waves, ice (most...

sea turtle

(Encyclopedia)sea turtle, name for several species of large marine turtles found in tropical and subtropical oceans. These turtles are modified for life in the ocean by having flipperlike forelimbs without toes and...

mass spectrograph

(Encyclopedia)mass spectrograph, device used to separate electrically charged particles according to their masses; a form of the instrument known as a mass spectrometer is often used to measure the masses of isotop...

Kati Thanda–Lake Eyre

(Encyclopedia)Kati Thanda–Lake Eyre, formerly Lake Eyre, shallow salt lake, central South Australia state, Australia. The lake, in fact two lakes connected by a channel, is the continent's lowest point (49 ft/15 ...

stealth technology

(Encyclopedia)stealth technology, designs and materials engineered for the military purpose of avoiding detection by radar or any other electronic system. Stealth, or antidetection, technology is applied to vehicle...

Princeton University

(Encyclopedia)Princeton University, at Princeton, N.J.; coeducational; chartered 1746, opened 1747, rechartered 1748, called the College of New Jersey until 1896. Established by the “New Light” (evangelical) ...

anchor

(Encyclopedia)anchor, device cast overboard to secure a ship, boat, or other floating object by means of weight, friction, or hooks called flukes. In ancient times an anchor was often merely a large stone, a bag or...

Monk, Meredith Jane

(Encyclopedia)Monk, Meredith Jane, 1942–, American dancer, choreographer, composer, singer, director, and filmmaker, b. Lima, Peru, grad. Sarah Lawrence College, 1964. A major figure in the avant-garde, she began...