Answer:
When the solar system settled into its current layout about 4.5 billion years ago, Earth formed when gravity pulled swirling gas and dust in to become the third planet from the Sun. Like its fellow terrestrial planets, Earth has a central core, a rocky mantle and a solid crust.
Explanation:
Answer:
1) made as an age pyramid that shows the youngest age of the object at the bottom and increases as it goes up
2) unusually high fertility or mortality or changes in the population due to immigration or emigration
3) pratically the same as 2
4)a high population of older age groups which signifies a high dependent population.
In east berlin industry usally cause pollution and west berlin industry let west know they were free
