Aa ~~ This type of lava goes out of vents very quickly and forms brittle jagged pieces

 

Paehoehoe ~~ Paehoehoe lava flows out slowly and turns into a rounded glassy surface

 

 

Pillow Lava ~~ Lava that forms underwater - also creates pillows hence the name

 

Blocky Lava ~~ Doesn't travel far - forms jumled heaps of sharp-edged chunks