by Julian Medina Ruiz, age 14
About 12 billion years ago, a big explosion, presently known as the “Big Bang,” created the universe.
The solar system we live in began to form 7.4 billion years ago. Earth was created by rock, ice, dust, and gas combining together. While forming, the Earth released an enormous amount of energy, causing the planet to heat up. For 100 million years, the components of planet Earth remained molten as they shifted into layers. Heavier minerals like iron and nickel, sank to the center and now form the dense core of the Earth, measuring 2,200 miles wide. The lighter minerals settled towards the surface of the Earth, creating its crust. The core and the crust are separated by 1,800 miles of molten rock, called the mantle. Certain lighter rocks gathered together to form “islands” or land. [Read More]