(Encyclopedia) parsecparsecpärˈsĕc [key] [parallax + second], in astronomy, basic unit of length for measuring interstellar and intergalactic distances, equal to 206,265 times the distance from the…
(Encyclopedia) British thermal unit, abbr. Btu, unit for measuring heat quantity in the customary system of English units of measurement, equal to the amount of heat required to raise the temperature…
(Encyclopedia) speleologyspeleologyspēlēŏlˈəjē [key], systematic exploration of caves, popularly called spelunking. It includes the measuring and mapping of caves and reporting on the flora and fauna…
The Wind in the WillowsWeatherMeasuring the AtmosphereThe Take on TemperatureIs the Pressure Getting to You?The Wind in the WillowsIt's Not the Heat, It's the HumidityMeasuring the RainPlacing the…
(Encyclopedia) Bounty, British naval vessel, a 220-ton (200-metric-ton), 85-ft (26-m) cutter, commanded by William Bligh. She set sail for the Pacific in Dec., 1787, to transport breadfruit trees…
(Encyclopedia) pound, abbr. lb, unit of either mass or force in the customary system of English units of measurement. Two different pounds of mass are defined, one in the avoirdupois system of units…
About 8,000 mini-quakes a day, and on average, one exceptionally big one per year by Borgna Brunner Earthquakes in residential areas, such as this 1964 one in Seward, Alaska, can…
Proving Angles Are CongruentGeometryProving Segment and Angle RelationshipsExploring MidpointsHow Many Midpoints Are There?Proving Angles Are CongruentUsing and Proving Angle ComplementsUsing and…
Putting the Data TogetherWeatherMeasuring the AtmosphereThe Take on TemperatureIs the Pressure Getting to You?The Wind in the WillowsIt's Not the Heat, It's the HumidityMeasuring the RainPlacing the…
