Answer:Fixation - Fixation is the first step in the process of making nitrogen usable by plants. Here bacteria change nitrogen into ammonium. Nitrification - This is the process by which ammonium gets changed into nitrates by bacteria. Nitrates are what the plants can then absorb
Explanation:
Answer:
B. Arising in the northern plains, this river flows through states between the Appalachian and rocky mountain ranges and dumps into the Gulf of Mexico.
Explanation:
Purpose: This preferred answer best illustrates the sequence of the Mississippi River. It accompanies the course described in choice B.
Glaciers cause erosion by abrasion and [plucking].
The sediment deposited by glaciers is called [till].
When a chunk of ice left behind by a receding glacier melts, the water stays in the kettle, forming a [kettle lake].
