Yes, silicon is extremely abundant in the Earth's crust. In fact, it's the second most abundant element after oxygen.

Here's a breakdown:

* Oxygen: Makes up about 46.6% of the Earth's crust by weight.

* Silicon: Makes up about 27.7% of the Earth's crust by weight.

So, silicon is a major component of the rocks and minerals that make up our planet. It's primarily found in compounds like silica (SiO2) and silicates, which are the building blocks of most rocks and minerals.