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The solar system was rotating clouds formed of gas and dust, which is known as the solar nebula. It started to evolve faster as the nebula was collapsing because of its gravity. The cloud flattened into a disk and formed the Sun pulling most of the materials were toward the center to form the Sun.
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Planetary accretion is the clouds of dust that are pushed together to create a massive object with gravitationally pulling more matter, mainly gaseous matter.
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Moon was formed when a Mars-sized object crashed into Earth. Small parts of the Earth crushed, and a collision threw clouds of debris, then clumped together and formed a new planet (moon).
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The planetary cooling formed the planet into a molten planet about 3.8 billion years ago. It created the planet to be heated, and the water on Earth cools off the surface and causes them to be hardened. Then, the heat in the Earth grows, which makes Earth rotate and create a magnetic field.
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Heavy Bombardment is the collision that affected the inner Solar System about 4 billion years ago. It was the addition of failed planets and small asteroids to create a larger object. Late Heavy Bombardment was the time when it nearly ends, which occurred about 3.8 billion years ago.
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The Earth's core formation occurred when the Solar System was less than 30 million years old (the inner core was formed about 1.5 billion years ago). The Earth created from a cloud of gas and dust and material began to gather to form planets known as planetesimals. A large rock crashed with other rocks/dust, and gravity pulled gas and dust in to become the third planet from the Sun.
