Answer:
a karst valley
Explanation:
Karst is a topography found in rainy regions with soluble rocks such as limestone, gypsum and dolomite. The rocks are reduced by dissolution, forming drainage systems with caves and sinkholes, which could be underground or exposed to the surface.
Answer:
changes in the earth are similar to the changes of human beings because it evolves at the same time and humans evolve the earth, without it the earth may never change and it will collapse.
I believe that the perpendicular equation would be the opposite sign and the reciprocal of the original slope. Then you just plug in the x and y coordinate to y=mx+b and solve for b.
y=4x+b
3=4(-4)+b
3=-16+b
b=19
y=4x+19
The correct answer is - A) subsistence farming.
Subsistence farming is the type of farming that is mostly practiced in the less developed countries. In here we have production that is just about enough for the needs of the country (and big portion of the production doesn't even come out on the home market, but you eat what you produce, or trade with someone you know). Also this type of farming is still based on primitive tools and is heavily dependant on the climate, and that makes it very unstable and more often than not people are starving because not enough food has been produced.