"All written work appears to the right of the red margin line ..... a crystal are perpendicular to the crystal faces and intersect in the center of the crystal. ... 28. What factors in nature can prevent natural crystals from forming with all faces visible? ..... Eventually, different layers, or zones, of soil become noticeable" (www.lcps.org/cms/lib4/VA01000195/.../2014%20semester%202%20Booklet.pdf)
Hope this helps
I think it's c but I'm not sure
Answer:
is used by commercial airplanes
Explanation:
The stratosphere is used by most commercial airplanes. This is because this layer of earth is stratified and more stable.
- The lowest level of the atmosphere is the troposphere.
- This layer is where all the bulk of the atmospheric gases are domiciled.
- Weather conditions occur here.
- This layer is not safe for flight due to its turbulent nature.
- The ionosphere is responsible for the transmission of radio signals around the earth.
- The earth's weather occurs in the region of the troposphere.
