A solar system is a group of planets that orbit around a sun (giant burning star) that has enough gravity to keep the planets from crashing into each other, as well as stop them from drifting away
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Productive Resources are resources used to make goods and services.
Therefore the best possible option is the last one - Factors that are used to make goods and services.
East of the Rocky Mountains is the so called Midwest region in North America. This vast region is mostly consisted of lowlands covered with grasses, and they are bordered with mountain ranges on both the east and the west, which prevents the maritime influence.
Because of this natural barriers, this region has mostly continental air masses influencing its climate. In the colder period of the year they are continental polar air masses, forming over Canada and moving southwards. In the warmer period of the year they are continental tropical, forming in the southern part of this region and moving northwards.
This type of air masses bring in very hot and dry summers, and very cold and snowy winters.
The Earth’s layers can be categorized mechanically or chemically. The chemical classification is more simple and includes the inner and outer core and the mantel which is divided into the upper and lower mantle. The crust is the surface. However, in the mechanical classification divides the lithosphere, the asthenosphere and the mesospheric. It is important to have the mechanical classification to understand the forces that move the tectonic plate.
