Since distances in the universe are incredible big, astronomers use Astronomical units, which the distance between the sun and the earth, to simplify calculations.
The Astronomical unit AU is the Earth’s average distance from the Sun. 1 AU is equivalent to 149,598,000 km or <span>92,955,807.273026 miles.
We can conclude that Astronomical units is the unit of measure that will be used to calculate the distance </span>between Venus and Earth.
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Rise in altitude is directly proportional to decrease in pressure
The earth's atmosphere has its own pressure known as atmospheric pressure.The pressure level is highest right at the surface of the earth because the air at this level is supporting the weight of all the air above it. More weight above means a greater downward gravitational force. As we move up through levels of the atmosphere, the air has less air mass above it and gravity isn’t strong enough to pull down a greater number of particles. So the balancing pressure decreases. This is why atmospheric pressure drops as we rise in altitude.
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Volcanic lightning is created when a volcano erupts and lots of tiny fine particles of volcanic ash form a cloud. Friction between the particles of ash and the gases emitted from the eruption cause differentces that create lightning. Friction between the particles of ash and the gases emitted from the eruption cause differentces that create lightning. The lightning usually occurs between clouds and from the eruption column to the crater.
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