Dense water sinks below less dense water. This is the principle that drives the deep ocean currents that circulate around the world. A combination of high salinity and low temperature near the surface makes seawater dense enough to sink into the deep ocean and flow along the bottom of the basins.
A plant that has a taproot system and has several growth rings and that is evident by the cross-section of the stem and has a layer that is a type of bark and is referred to as an angiosperm.
It has about three to four parts of multiple vascular rings and columns in the stems.
