A part of a shore that sticks out into the ocean because it's made up of harder rock is called a headland.

Here's why:

* Harder Rock: Headlands are formed when the coastline is made up of resistant rock, like granite or basalt. These rocks erode much slower than softer rocks like sandstone or clay.

* Erosion: While waves erode the softer rock around the headland, the harder rock resists, creating a prominent projection.

* Ocean: The headland extends into the ocean, forming a distinct point of land jutting out into the water.