Answer:
Correct answer is D. Physical geography
Explanation:
A is not correct as human geography focuses more on the interaction between people and the areas that surrounds them. Their culture, economy, development...
B is not correct as cartography focuses on the map making process.
C is not correct as demography studies the human population.
D is correct as all of the mentioned features are a part of physical geography.
Subduction occurs when two different plates collide
A river's width and depth increases as more water is added from tributaries.
High concentration has a acidic property while low concentration has a basic property.