Question: How was the Earth Created and How do we Know for Sure?
It all started as a big solar nebula, which is a cloud of dust and debris. As it started spinning, some of the debris created the Sun. With gravity, the particles started clumping together, creating smaller planets such as Earth. After the core was formed, it started building on more, such as the mantle and the tectonic plates, and then finally the crust. Shortly after (considering how long it has been around now), the Earth was formed, and life started appearing.
But, how do we know this for sure? Scientists use what is known as radiometric dating. They take pieces of rock and look at the level of radioactivity, indicating generally how old it is. They found a piece of Acasta Gneisses near Slave Lake, dating back to around 4 billion years ago. They also found zircon in Australia from just over 4.5 billion years ago. Samples from missions Apollo and Luna to the moon confirm the age of 4.5 billion.