The natural resources and deposits of the Gulf coastal plain have boosted its industries and economy and have attracted many people to the sub-region. Houston has the third-largest seaport in the country and a major center of international shipping. but the chief economic activity of the Gulf coastal plain is the oil, petroleum and natural gas production.
Shale and sandstone are clastic rocks and they both have a smooth texture. Shale is made of tiny particles of clay. Sandstone is made of sand and quartz. while Shale forms from compaction.
