Module 6- The Mariana Trench (start story on Th, 2-5)
trench a long, narrow groove or ditch
summit top or highest point
thrive something grows well and is healthy
prehistoric something that is very old, from a time before history was recorded
vital needed or very important
glimpse very quick look at something
submersible something that can go and work under water
remotely control something from a distance
autonomous something controls itself