Here's why:

* Composition: Granite is an igneous rock, meaning it formed from cooled and solidified magma. It's rich in minerals like quartz, feldspar, and mica, which are common in the continental crust.

* Location: Granite is often found in mountain ranges, plateaus, and other areas of uplifted land. This is because granite is typically formed deep within the Earth's crust, and then exposed through tectonic processes.

* Density: Granite is less dense than the rocks that make up the oceanic crust (like basalt). This is why continents rise above the ocean floor.

While granite is not the only rock found in the continental crust, it's a very important component and is often used as a representative example.