Martian craters are commonly classified by their ejecta. Noachian terrains consist of overlapping and interbedded ejecta blankets of many old craters. Relatively young craters with rays of ejecta are also visible. Many large craters are surrounded by bright impact ejecta (rays) consisting of relatively fresh ice. Bedrock stratigraphy in the area includes volcanic deposits, volcanic ejecta, and fluviolacustrine deposits. Therein the antimatter forms a wind which crashes upon the ejecta of the progenitor supernovae. Io's volcanic ejecta also produce a large plasma torus around Jupiter. Tuff cones in addition can also contain non-magmatic ejecta. Mars also has an atmosphere that plays a role in ejecta emplacement and subsequent erosion. The torus composes about 25% of the visible ejecta. Models for hypernova focus on the efficient transfer of energy into the ejecta. About 74,000 years ago, this Indonesian volcano released about dense-rock equivalent of ejecta. Most of the ejecta that came out of a volcano is gas. The excreted material may be called "ejecta". These speeds are highly supersonic, so a strong shock wave forms ahead of the ejecta.