Which of the following is NOT considered a rock?
-Coal
-Sandstone
-Pumice
-Lava

Question

Which of the following is NOT considered a rock?
-Coal
-Sandstone
-Pumice 
-Lava

anonymous · Answer

this question would work better in biology

anonymous · Answer

Lava. Lava is the molten *precursor* to rock. Coal is a sedimentary rock, as is sandstone. Pumice is a highly vesicular (lots of holes) igneous rock. Lava is what comes out of volcanoes. It has all of the minerals that will eventually *make* an igneous rock when it cools, but it is not a rock until it cools, ceasing to be lava and becoming an igneous rock. Sometimes lava is referred to as "molten rock" but it is still not actually a rock type. Just the ingredients. Source: Geologist http://www.galleries.com/rocks/pumice.ht... http://www.galleries.com/rocks/coal.htm http://www.galleries.com/rocks/sandstone... http://www.wisegeek.com/what-is-lava.htm

anonymous · Answer

@emok9893 oh, I forgot I was still in History

anonymous · Answer

its okay

anonymous · Answer

lol