Pebbles Sand Silt

Geologist

How do these pebbles turn into sand???

gravelSilt

cobbles

clayboulder

pebbles

sand

ClaySilt

Sand

GravelPebbles

CobblesBoulders

ClaySilt

Sand

GravelPebbles

CobblesBoulders

Which of these is the size of dust ?It is the smallest rock you have studied

CLAYPieces of rock that are

the size of dust

Collection

reddish bubbly rock. Once the top of the lava

Scoria-

light, soft, smooth rock that comes from the ashes of the volcano

Tuff-

grey rock that was once hot liquid lava

Basalt

chalky rocks

silt sand

humus = dead plant materials

These earth materials make_______soil.