A topographical map shows elevation
<span>The depression at the top of the volcano is called as a crater. It is roughly circular, and possesses one or more vents. At the time of volcanic eruptions, the magma and the lava are erupted from the crater itself. The crater may also break during eruption, and such craters have a lower rim on one side of the volcano.</span>
<span>On earth, the four major spheres interact as a system.
Atmosphere, biosphere, hydrosphere are absent.
Carbon, Oxygen cycle.
water circuit
tsunami (there is no water so no tsunami)
absence of life
there is no atmosphere so all meteorites directly interact with moon surface. On Earth they can be burn into the atmosphere due to the friction process</span>
GPS Satellite Constellation: The baseline satellite constellation consists of 24 satellites positioned in six earth-centered orbital planes withfour operation satellites and a spare satellite slot in each orbital plane. The system can support a constellation of up to thirty satellites in orbit.
