Differentiation is the process in planetary formation when heavy materials sink toward the planet's center and lighter materials accummulate near its surface. The term differentiation is a scientific term which really means "to separate". Planetary elements which separate include iron, which is heavy and silicate rock, which is lighter. Iron falls to the center of a planet and forms a core, silicate material stays in the middle, ice stays near the top.
b) on a regular basis over a long period of time.
c) often but only during severe weather.
d) frequently for a couple of days every year.
b. 45 million years.
c. 500 million years.
d. 3.5 billion years
Correct answer choice is :
The Northeast is hometown to famous cities and vast agricultural areas that assist as valuable natural environments and agricultural lands. Climate differs broadly across the range and serves to be coldest in the north, at steep heights, and away from the shore. Higher temperatures in the Northeast are expected to rise heat-related deaths and reduce air quality, particularly in city areas.
B) technology.
C) government.
D) architecture.