Fault-block mountains form when Earth's crust pushes material up and down near a fault line.<span> Rocks that get pushed upward eventually form mountains if there is enough seismic activity. The higher part of a fault-block area is called a horst, while the lower part is called a graben, according to Ducksters.
</span>
Radioactive elements comprise a majority of the "ACTINIDES"
These are elements in the bottom row of the periodic table.
Add a picture so I can tell you
