Acomposite volcano has magma that a) is thick and slow moving. b) contain lots of debris like rocks and plant materials. c) cools quickly and is full of gas bubbles.. d) is thin, fast moving and spreads quickly.

A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice and ash. ... The lava flowing from stratovolcanoes typically cools and hardens before spreading far, due to high viscosity. Sorry I'm late i hope i answered your question tho

Answer sinking and cooled;