Why is the line-item veto considered to be unconstitutional?

You have been tasked with sorting the rock samples shown into three categories, with two rocks in each category. what attribute would you use to sort these rocks? which rocks would be in each category? rocks: obsidian, coquina limestone, granite, soapstone,pumice, and gneiss.

Why are there restrictions to traveling to cuba?

Which country has the largest salt flats in the world