What is a volcanic bomb?
a. a very violent volcanic explosion
b. a particle larger than 64 mm in size ejected as glowing lava
c. a pocket of gas that is released suddenly
d. a tiny particle of ejected rock less than 64 mm in size

Seed plants that lived during the carboniferous impact life on earth today because a. they are the ancestors of all plant life on earth. b. their remains formed coal, which is an important resource. c. they produced fossils that are used to date many geologic events. d. their presence caused oxygen levels to drop, allowing animals to evolve.

¿cual es mas alta en baja california,la migracion o la inmigracion?

How can minerals crystallize from materials dissolved in water? check all that apply.