Which layers are impermeable ? layer of loose soil

layer of sand

layer of gravel

layer of hard clay

solid rock
HELP ASAP!

Impermeable and/or non-porous materials include clay, non-fractured igneous and metamorphic rocks. Porous/permeable layers are called aquifers; impermeable layers called aquiludes.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

a- all cells come from pre-existing cells