Earth Sceince 7-2

Front 1

mafic lava

Back 1

dark-colored lava rich in magnesium and iron

Front 2

lapilli

Back 2

pyroclastic particles between 2 mm and 64 mm in diameter

Front 3

volcanic ash

Back 3

pyroclastic particles between 0.25 mm and 2 mm in
diameter

Front 4

volcanic bomb

Back 4

large, spindle-shaped clot of lava thrown out of a
volcano

Front 5

volcanic dust

Back 5

pyroclastic particles less than 0.25 mm in diameter

Front 6

aa

Back 6

jagged chunks of lava formed by rapid cooling on the surface of a lava
flow

Front 7

pahoehoe

Back 7

solidified mafic lava with a wrinkled surface

Front 8

sheild volcano

Back 8

has a cone of hardened lava that forms a broad base and gentle
slopes

Front 9

starto volcano

Back 9

also called composite volcano, steep-sloped volcanic deposit
with alternating layers of hardened lava flows and pyroclastic material

Front 10

felsic lava

Back 10

silica-rich lava

Front 11

caldrea

Back 11

large basin-shaped depression formed when an explosion destroys the
upper part of a volcanic cone or when the magma chamber below a volcano is
emptied during an eruption

Front 12

cinder cone

Back 12

steep-sloped deposit of solid fragments ejected from a
volcano

Front 13

composite volcano

Back 13

also called stratovolcano, steep-sloped volcanic deposit
with alternating layers of hardened lava flows and pyroclastic materials

Front 14

crater

Back 14

funnel-shaped pit at the top of a volcanic cone

Front 15

volcanic block

Back 15

the largest possible pyroclastic material that is formed from
solid rock blasted from a volcanic fissure