Which tectonic plate is primarily comprised of seafloor crust ?

A tectonic plate is a large slab of rock and is a fundamental building block upon the Earth. There are seven or eight (depending how they are defined) major tectonic plates upon the Earth and depending upon their location can vary in consistency. It is the Eurasian plate that mainly consists of oceanic crust.

If you're looking for an even spread of clay, silt and sand, add a considerable amount of sand and some clay until the 3 even out". soil texture triangle. silty clay loam soil is approximately 20 percent or less sand, 25 to 40 percent clay, and 40 to 70 percent silt.