Researchers in the 1940s found that sediment on the seafloor was thinner than expected. how did this provide evidence for continental drift?

because this seafloor was relatively old, the sediment had turned to rock.
because this seafloor was relatively young, there had been less time for sediment to accumulate.
the motion of the continents caused sediment to fall away from the seafloor.
the motion of the continents caused sediment to be ground up into smaller pieces.

Cutting and burning the skin are two examples of

Sedimentary rock formation occurs when igneous, metamorphic, or other sedimentary rocks are exposed to the unyielding forces of nature found on the earth's surface. the formation of sedimentary rock occurs by several processes over millions of years. when rock sediments are deposited, an increase in weight causes pressure to increase which leads to the compaction of the rock particles. water is pushed out and cementation occurs as dissolved minerals are deposited in the very small spaces between the rock sediments acting as glue that binds the sediments together. which process describes the changing of sediments into rock by compaction and cementation? a) deposition b) lithification c) physical weathering d) chemical weathering

If you wanted to follow the longest river and hike upstream, which direction would you head