By Rob Nagel
Comprises six hundred themes within the lifestyles, earth, and actual sciences in addition to in engineering, know-how, math, environmental technological know-how, and psychology.
Read or Download UXL Encyclopedia of Science (Vol. 1 A -As) PDF
Similar rivers books
Contains six hundred subject matters within the existence, earth, and actual sciences in addition to in engineering, know-how, math, environmental technological know-how, and psychology.
Methane is a strong greenhouse fuel and is expected to be liable for nearly one-fifth of synthetic worldwide warming. according to kilogram, it is twenty-five instances extra strong than carbon dioxide over a 100-year time horizon – and worldwide warming is probably going to reinforce methane unencumber from a few resources.
Tropical coastal deltas characterize the most varied and swiftly altering biophysical areas within the constructing global. those deltas are domestic to giant populated parts, are major centres of agricultural construction and commercial improvement, and comprise fragile ecosystems which are now dealing with new threats due to anticipated sea-level rises linked to worldwide warming.
Hard work Erde ist eine brillante Einführung in das Studium des Planeten Erde, von den kosmischen Ursprüngen ihrer Elemente bis hin zu der Beeinflussung der Atmosphäre durch die Menschheit und den klimatischen Änderungen, die uns bevorstehen. Das Buch ist ebenso eine Beschreibung der Prozesse, die zur Entwicklung der Erde beigetragen haben, wie eine Darstellung der paintings, in der Wissenschaftler denken und Probleme lösen.
Extra resources for UXL Encyclopedia of Science (Vol. 1 A -As)
Infrasonic vibrations: A rate of vibration below the range of human hearing, that is, below about 10 cycles per second. Longitudinal wave: A wave whose motion of vibration is in the direction of the wave’s advancement—the same direction in which the wave is traveling. Loudspeaker: A device to produce sounds from an electric current—by electrical and mechanical means—in the range of frequencies around the sonic range (that is produced by humans). is placed inside a jar from which all air has been removed.
It is even more abundant than uranium, ranking number 39 in abundance among the elements in Earth’s crust. No more than a few hundred tons of thorium are produced annually. About one-half of this production goes to the manufacture of gas mantles, insulated chambers in which fuel is burned. The rest goes for use as nuclear fuel, in sunlamps (electric lamps that emit radiation; often used for tanning), in photoelectric cells (vacuum tubes in which electric current flows when light strikes the photosensitive—or light sensitive—cathode), and in the production of other alloys (a mixture of two or more metals or a metal and a nonmetal).
One of the most important acoustical devices from the human point of view is the hearing aid. The hearing aid is a system consisting of miniature microphones, amplifiers, and loudspeakers that make it easier for people with hearing difficulties to understand sounds. One of the first large-scale industrial applications of acoustics was sonar. Sonar stands for the phrase sound navigation ranging. S. military during World War I (1914–18) for the detec2 2 U•X•L Encyclopedia of Science, 2nd Edition tion of submarines and continues to be an invaluable device for navies throughout the world.