__ rock has undergone heat or pressure causing it to change form. Conglomerate Igneous Sedimentary Metamorphic

## Step 1<br />The question is asking us to identify the type of rock that has undergone heat or pressure causing it to change form. This is a characteristic of metamorphic rocks.<br /><br />## Step 2<br />Metamorphic rocks are formed when existing rocks are subjected to high levels of heat and pressure, causing them to change physically or chemically. This process is known as metamorphism.<br /><br />## Step 3<br />The other options provided, conglomerate, igneous, and sedimentary, are not the correct answers because they do not undergo such changes due to heat or pressure.