What does the author list and describe in the passage?
A) the positive effects of industrialization
B) the tourism industry around the Grand Canyon
C) the history of climate change
D) the ways that moving water can shape and change the land

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

the answer to your question is c