The sub-grade's compacted soil, topped by the sub-base of crushed stone and then the pea gravel.
Cement is a material that can be used for driveway paving. Two more, very diverse options for paving ones driveway are asphalt and pea gravel. Asphalt and cement are the two of the three most commonly used options.
Mostly quartz.
Same
Pea gravel consists of small, rounded stones often used for walkways, animal pens, and other places where sharp gravel isn't wanted. Pea gravel can come in more than one size but is typically anywhere from 1/8 of an inch to 3/8 or an inch in diameter.
43 pounds
Pea gravel, crushed granite or asphalt.
base needs to be 2" of a pea gravel with a 2" of tampered sand on top.
typically the size of peas hence the name pea gravel
Cement is a material that can be used for driveway paving. Two more, very diverse options for paving ones driveway are asphalt and pea gravel. Asphalt and cement are the two of the three most commonly used options.
The volume that needs to be filled is 11 x 45 x 0.5 = 247.5 cubic feet, say 250.There is a lot of info if you google pea gravel weight. The most frequent weight I saw in those postings was about 100 lbs per cubic foot. So the weight of 250 cuft of pea gravel is about25,000 lbs or 12.5 tons.
Pea stone is gravel that is about 1/4 inch in diameter (the size of a pea).
You can remove the stain from the gravel the same way you clean the driveway, with muratic acid sprayed from a pump sprayer. Im not sure of your budget constraints on this, because the dimensions of the playground is not given.
10.5 cu ft
Pea gravel works if you use it at the bottom of an aquarium. You can also use it to make walkways and other concrete surfaces.
Mostly quartz.
Same
It stands for Aggregate Base Course. It is also a mix of different rock sizes. A is pea gravel. B is less than one inch. C is about 1 1/2 inches.