Percents help us understand how the parts of something, like a pizza slice or a natural event, relate to the entirety of the pie or Earth’s history. Calculate the length of time of the following events as a percent of Earth’s age. Round the age of Earth to 5 billion years old.

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet? the planet started to cool and an atmosphere formed. the planet started to become round and heat up. the planet started to wobble and turned upside down. the planet started to compress rock and form more radioactive elements.