You have been given a sample of quartz, which has a hardness of 7. how can you use this mineral to determine the hardness of other minerals?

yes, by seeing if another rock makes a white mark on it, you know that the rock that caused the white mark is stronger or more durable than the other one

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.