Determine the contour interval

Porphyritic texture is an igneous rock texture in which large crystals are set in a finer-grained or glassy groundmass.

Which side of Coren Swamp has the steepest gradient?

Which of the below is a limitation of performing sieve analysis?

How many crest does this contour has?

________is metamorphosed limestone (or dolostone) composed of calcite (or dolomite)

This rock was molten lava that  cooled as it came out of a volcano.

The way light reflects off of a mineral is it's_______

Which cross section represent this contour lines?

What is the range grain size of fine sand?