The corona
A.
emits the Sun's visible light that we see.
B.
is the outermost layer of the Sun's atmosphere.
C.
is the Sun's deepest interior layer.
D.
is a dark spot on the Sun's photosphere.

B. the outer most layer of the sun's atmosphere

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.