In caves, stalactites form when minerals are left behind by water. stalactites are

-chemical sedimentary rocks
-clastic sedimentary rocks
-intrusive igneous rocks
-extrusive igneous rocks

The best answer to the question presented above would be the first statement. Stalactites are chemical sedimentary rocks that form when the minerals in the cave are left behind by the water. They saturate and form into these stalactites. 

Maybe a horizontal because its a pattern

Answer the above statement is correct (true);