Answer:
Sierra Madre Occidental
Explanation:
this mountain range takes up nearly 140,000 square miles of Mexico.
Answer:
None
Explanation:
Quartz is a silicate mineral. It is made up of interlocking chain of silica that forms a framework pattern. Pure quartz is made up of silica and silica alone. Silica has a formula of SiO₂. Quartz is pure silica.
Fe and Mg are not in the framework of silica. They even rarely occur as impurities in the structure of the mineral.
The correct answer is letter B. V-shaped Valley. It is the evidence that an area was once covered by a glacier. Glaciers form in an area where the temperature is so very low and stayed there for a longer time. Glaciers that reached the oceans form icebergs.
Answer: All scientific instruments are complex and expensive.
Explanation:
I just had this one today and got it right.