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Possible definitions for yearth

earth
Third planet in distance outward from the sun. Believed to be about 4.6 billion years old, it is about 92,960,000 mi (149,573,000 km) away from the sun. It orbits the sun at a speed of 18.5 mi (29.8 km) per second, making one complete revolution in 365.25 days. As it revolves, it spins on its axis, rotating once every 23 hours 56 minutes 4 seconds. The fifth largest planet of the solar system, it has an equatorial circumference of 24,902 mi (40,076 km). Its total surface area is roughly 197,000,000 sq mi (509,600,000 sq km), of which about 29% is land. Earth's atmosphere consists of a mixture of gases, chiefly nitrogen and oxygen. Its only natural satellite, the moon, orbits the planet at a distance of about 238,870 mi (384,400 km). The earth's surface is subdivided into seven continental masses: Africa, Antarctica, Asia, Australia, Europe, N. America, and S. America. These continents are surrounded by the so-called World Ocean, which is broken down into three major bodies: the Atlantic, Pacific, and Indian oceans.


Barth
Swiss theologian. Born in Basel, he studied at the Univs. of Berlin, T\u00fc bingen, and Marburg. In 1911-21 he was a pastor at Safenwil, Switzerland. The tragedy of World War I made him question the liberal theology of his teachers, rooted in post-Enlightenment ideas. With The Epistle to the Romans (1919) he inaugurated a radical turnaround in Protestant thought, initiating a trend toward neoorthodoxy. The work led to his appointment as professor at G\u00f6 ttingen (1921), M\u00fc nster (1925), and Bonn (1930). He was a founder of the Confessing Church, which opposed the Nazi regime; when his refusal to take the oath of allegiance to Hitler cost him his chair at Bonn, he returned to Basel. He spoke at the opening of the World Council of Churches in 1948 and visited Rome following the Second Vatican Council.


health
Extent of continuing physical, emotional, mental, and social ability to cope with one's environment. Good health is harder to define than bad health (which can be equated with presence of disease) because it must convey a more positive concept than mere absence of disease, and there is a variable area between health and disease. A person may be in good physical condition but have a cold or be mentally ill. Someone may appear healthy but have a serious condition (e.g., cancer) that is detectable only by physical examination or diagnostic tests, or not even by these.


heart
Organ that pumps blood, circulating it to all parts of the body (see circulation). The human heart is a four-chambered double pump with its right and left sides fully separated by a septum and subdivided on both sides into an atrium above and a ventricle below. The right heart receives venous blood from the superior and inferior venae cavae (see vena cava) and propels it into the pulmonary circulation. The left heart takes in blood from the pulmonary veins and sends it ...

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