I thought Muslims perform their burials in style of compost. In Pakistan, The dead body is wrapped in cloth shroud and the grave is dug six feet and is lined

I thought Muslims perform their burials in style of compost. In Pakistan, The dead body is wrapped in cloth shroud and the grave is dug six feet and is lined with concrete blocks (ground is bare Earth). Coffin is not used. The body is laid in the grave then if I remember correctly, grave is covered partially (25% - 33%?) with soil and then thick concrete/stone slabs are placed on top to cover the grave. After that, the grave is covered with mound of Earth.