drowned valley formed an inlet of the sea called tunnel valley.
drowned valley formed an inlet of the sea called tunnel valley.
drowned valley forming an inlet of the sea?
tunnel valley
geographically, southampton water is classified as a ria, or drowned valley, of the english channel. it was formed by the rivers test, itchen and hamble which flow into it, and became an inlet of the sea at the end of the last ice age when sea levels rose, flooding many valleys in the south of england. in particular, it is likely that southampton water formed partly due to the submerging of the river solent which previously flowed through the area, and of which the river test, river itchen and river medina are thought to be tributaries.
southampton water
afghanite, (na,k)ca[sialo](so)cl, is a hydrous sodium, calcium, potassium, sulfate, chloride, carbonate alumino-silicate mineral. afghanite is a feldspathoid of the cancrinite group and typically occurs with sodalite group minerals. it forms blue to colorless, typically massive crystals in the trigonal crystal system. the lowering of the symmetry from typical (for cancrinite group) hexagonal one is due to ordering of si and al. it has a mohs hardness of 5.5 to 6 and a specific gravity of 2.55 to 2.65. it has refractive index values of nω=1.523 and nε=1.529. it has one direction of perfect cleavage and exhibits conchoidal fracture. it fluoresces a bright orange.
afghanite