Magma


hot, pasty rock that moves inside of earth's mantle



Source
https://www.google.com/search?q=lava&biw=1262&bih=649&source=lnms&tbm=isch&sa=X&ei=xIFBVdi0BaPLsAS724CoBg&ved=0CAYQ_AUoAQ#tbm=isch&q=magma+chamber&revid=1920478539&imgrc=-ORimAH_fD7mvM%253A%3BVDsBWefG7WZewM%3Bhttp%253A%252F%252Fwww.geology4today.com%252Fuploads%252F1%252F8%252F1%252F6%252F18166011%252F5651434_orig.jpg%253F1403369195%3Bhttp%253A%252F%252Fwww.geology4today.com%252Fthree-major-rock-types.html%3B640%3B360