Marta is trying to determine which science investigation she should do for the school science fair. She knows
that some investigations involve an experiment and that
some only involve making observations. Which question
is one that she can answer by performing a scientific
experiment, instead of only making observations?

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.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

i won't lie i don't know so go online and ask google thats what i do