soil
what is soil made from
air water
dimond is what on the mohns scale
10
what is a rock
a solid material
what are three types of soil
sand
silt
clay
what scratches topaz
drill bit
what are some types of igneous rocks are there
basalt
obsidian
granite
gabbro
what are the 5 layers of soil
o horizon
a horizon
e horizon
c horizon
r horizon
what are some types of metamorphic rocks
slate
gneiss
marble
what is soil a mixture of
decayed organic mater
organisms
minerals
broken rocks
air and water
what are some types of sedimentary rocks
shale
limestone
sandstone
what is the three main types of rocks
sedimentary
metamorphic
igneous