Convection occurs over a very very long time in the earth's mantle. Rock slowly gets melted down from the core, then shoots back up from volcanoes. The new rocks get buried by sand and sediments, and the process resets.
(States)gas particles are separated away from each other as far as they can. liquid particles are all connected in a non formation. solids particles are tightly packed.
The plain is an open ecosystem due to it is vulnerable and may be destroyed
