Reaction Paper (Earth Science)

635 WordsJul 23, 20153 Pages
Vincent P. Salarda BSBA-1B Earth Science TTH: 2:30pm-4pm 07/21/15 07/23/15 Prof. Pinky de Garcia “ Intoduction to Earth Science “ Earth is the densest planet in our Solar System. It has a density of 5.51 grams per cubic centimeter. This is only the average density of the planet. The core is much denser than the oceans for example. Actually, scientists believe that the massive amounts of iron in our planet’s core is what makes it so dense. All of the planets are round because of gravity. When our Solar System was forming, gravity gathered billions of pieces of gas and dust into clumps which grew larger and larger to become the planets. The force of the collision of these pieces caused the newly forming planets to become hot and molten. The force of gravity, pulled this molten material inwards towards the planet's center into the shape of a sphere. Later, when the planets cooled, they stayed spherical. Planets are not perfectly spherical because they also spin. The spinning force acts against gravity and causes many planets to bulge out more around their equators. They are all much larger than the terrestrial planets and are quite different from them in terms of structure and composition. For example, they have no solid surfaces and their outer layers are composed predominately of light gases. There are quite a few objects in the universe capable of causing a really, really bad day on planet Earth, including a wayward comet or large asteroid. Most meteors, however, are not very high on an astronomer's scale of scary extraterrestrial events. There are a number of differences between a comet

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