Figure 8-43 Pieces of the Moon and Mars on Earth (a) Meteorite from the Moon composed of compacted regolith (see Section 6-6). (b) A piece of the Tissint meteorite that landed in Morocco in 2011. Ejected from Mars as a result of an impact 700,000 years ago, it is Martian lava that was weathered on Mars, primarily by water flow. It contains trapped gases from Mars’s atmosphere.