Groundwater<span> also can </span>cause erosion<span> under the surface. As water flows through the soil, acid is formed. ... Minerals that are carried in </span>groundwater<span> can also be </span>deposited<span> in other places. This cycle of </span>erosion and deposition<span> can </span>cause <span>underground caves to form.</span>
1. lifeless
2. evaporation
3. seeps into
4. surface, pycnocline, deep
5. food web
6. photic
Answer:
1860s
Choice D is correct
Explanation:
The US labor movement began in the 1860s