head-on-collision. noun. (plural head-on collisions) (transport) a collision where the front ends of two vehicles (such as ships, trains, cars, planes, etc.) hit each other, as opposed to a side-collision or rear-end collision.
chemistry can help us to understand, monitor, protect and improve the environment around us. chemists are developing tools and techniques to make sure that we can see and measure air and water pollution. they have helped to build the evidence that shows how our climate has changed over time.
what do you mean by chime?
kapag may sasabog na bulkan,o kung gumagalaw yung mga bato sa ilalim ng lupa
nangyayari ito kapag may maaaring sumabong sa bulkan o gumalaw yung mga malalaking bato sa ilalim ng lupang ibabaw