Use of fertilizer *crop rotation
*use of seedlings
*improved irrigation
*new types of plows

The above list describes agricultural improvements under the
A.
Song Dynasty.
B.
Sui Dynasty.
C.
Yuan Dynasty.
D.
Ming Dynasty.

well that depends on how deep the hole is. you'd first go through te crust of the earth, then the upper mantle, then the lower mantle then the outer core, then the inner cor then you'd be stuck in the core to melt.

the answer would more than likely a.)falling crop prices  

hope the answer is right and ,either way have a nice day.

they change the constitution.

the answer would be c epic   an epic is a long narrative poem about a heroic figure