mindmap root((SPHER)) spherical Relating to a sphere; shaped like a sphere or one of its segments.
🌱The girls agreed that the spacecraft had been deep blue and perfectly spherical, and that its alien passengers had resembled large praying mantises. 🌳Something spherical is like a *sphere* in being round, or more or less round, in three dimensions. Apples and oranges are both spherical, for example, even though they're never perfectly round. A *spheroid* has a roughly spherical shape; so an asteroid, for instance, is often *spheroidal*—fairly round, but lumpy. stratosphere 1、 The part of the earth's atmosphere that extends from about seven to about 30 miles above the surface.
2、 A very high or the highest region.
🌱In the celebrity stratosphere she now occupied, a fee of 12 million dollars per film was a reasonable rate. 🌳The stratosphere （*strato-* simply means "layer" or "level"） lies above the earth's weather and mostly changes very little. It contains the ozone layer, which shields us from the sun's ultraviolet radiation except where it's been harmed by manmade chemicals. The levels of the *atmosphere* are marked particularly by their temperatures; *stratospheric* temperatures rise only to around 32°—very moderate considering that temperatures in the *troposphere* below may descend to about -70° and those in the *ionosphere* above may rise to 1000°. biosphere 1、 The part of the world in which life can exist.
2、 Living things and their environment.
🌱The moon has no biosphere, so an artificial one would have to be constructed for any long-term stay. 🌳The *lithosphere* is the solid surface of the earth （*lith-* meaning "rock"）; the *hydrosphere* is the earth's water （*hydro-* means "water"）, including the clouds and water vapor in the air; and the *atmosphere* is the earth's air （*atmos-* meaning "vapor"）. The term *biosphere* can include all of these, along with the 10 million species of living things they contain. The biosphere recycles its air, water, organisms, and minerals constantly to maintain an amazingly balanced state; human beings should probably do their best to imitate it. Though the word has a new sound to it, it was first used over a hundred years ago. hemisphere Half a sphere, especially half the global sphere as divided by the equator or a meridian.
🌱A sailor who crosses the equator from the northern to the southern hemisphere for the first time is traditionally given a special initiation. 🌳*Hemisphere* includes the prefix *hemi-*, meaning "half." The northern and southern hemispheres are divided by the equator, the circle halfway between Earth's two poles. The eastern and western hemispheres aren't divided so exactly, since there are no poles in the Earth's east-west dimension. Often the dividing line is said to be the "prime meridian"—the imaginary north-south line that runs through Greenwich, England, from which all longitude is calculated （itself being the 0° meridian）. But for simplicity's sake, the eastern hemisphere is often said to include all of Europe, Africa, Australia, and Asia, while the western hemisphere contains North and South America and a great deal of ocean.