Earth's layers formed as result of differentiation. during differentiation, different zones of elements form layers and today we know these layers are made up of different elements. certain elements sunk to the center while others collected near the surface. we might predict that the elements, like iron and nickel, formed the core. a) more dense b) least dense c) light weight d) first crystallized

The correct answer is option A, that is, more dense.  

The organization or differentiation of the Earth into layers is perhaps the most substantial incident in its history. It resulted in the generation of a core, a crust, and finally the continents. The different layers, that is, the core, mantle, crust, and ocean possess different densities, and thus, their masses are also distinct.  

The core of the Earth is made up of denser solid iron-nickel alloy in the inner core, and liquid iron-nickel present in the outer core.  

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )