What is the positive and negative effect that occurs when people interact with the environment called?

What is a small water source like a stream or brook?

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.

Identify the type of weathering seen in each picture ? chemical weathering mechanical weathering