It is a terrestrial planet.
It was formed from gas and dust.
It was formed in a debris disk from colliding planetesimals.
Explanation:
The earth is one of the four terrestrial planets that orbits the sun and forms a significant part of the solar system.
The solar system is made up of the planets moving round the sun which is the star. The satellites moves round the planets. Also, there are other interplanetary bodies that moves in the solar system.
- According to the solar nebular theory, the earth was formed from a gas of intersellar dust which was rotating.
- Intense pressure and temperature led to the collapse of the core under gravitational pull. The core formed the sun.
- The debris disk accreted to form several planetesimmals from which the earth was derived.
- Most of the solid and denser materials were pulled in closely to sun and they are rock balls called terrestrial planets.
- The outer parts are gas giants.
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Answer:
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Answer and Explanation:
- the upper boundary of sub alpine ecosystem is known as tree line and lower boundary of sub alpine ecosystem is known is montane zone
- the tree line is the edge of habitat at which trees are capable of growing it is found at very high elevation beyond this there is no life of trees
- the upper montane zone is vegetarian type generally found above the mixed coniferous forest and bellow the sub alpine forest
HOW DOES IT VARIES ACROSS THE STATE :
- the marginal conditions make the sub alpine ecosystem sensitive to environment change
- the long lived nature of the sub alpine species make the zone a good study system
