Tuff consists of volcanic ash, pumice, and other rocks erupted by a volcano that have been hardened together by either compaction, heat, or chemical cementation so that the initially loose material forms a hard rock.
(Tuff consists of volcanic ash, pumice, and other rocks; erupted; ) (a volcano; have been hardened together; by either compaction, heat, or chemical cementation) (the initially loose material; forms; a hard rock)
Tuff consists of volcanic ash, pumice, and other rocks a volcano the initially loose material
erupted have been hardened together forms
by either compaction, heat, or chemical cementation
a hard rock