a place where magma (molten rock) and/or gas comes to the surface from within the earth’s core (A1)

fragments of lava or already solidified rock that is thrown into the air (or ‘ejected’) by a volcanic explosion (A1)

volcanic ejecta that is less than .5 centimeters (.2 inch) in diameter comprised of already solid rock, crystals from solid rock, or particles of lava that were thrown up as liquid spray (A1)

fluidity (A1)

a hole left behind when lava cools quickly and traps gases (A1)

volcanic ejecta (A1)

volcanic ejecta that is partly liquid when it strikes the ground, flattening out or splashing when it hits (A1)

as in the geologic time scale, one that expresses age or length in relationship to other periods of time or geologic formations (A1)

establishing an age based on changes in atomic structure (A1)

a process for determining the age of organic (carbon-containing) materials using the rate of radioactive decay of Carbon-14, also known as Carbon-14 (C-14) dating (A1)