Solve these clues to fill the grid.
- The visual percept of a region
- 4 Across
- United States railroad tycoon
- 7 Across
- An exchange of molecules across the boundary between adjacent layers of a fluid or across cell
- 8 Across
- An unconscious process that tries to reduce the anxiety associated with instinctive desires
- 10 Across
- United States film actress (plural)
- 12 Across
- An implement used in the practice of a vocation (plural)
- 13 Across
- Long stream of water flowing to the sea
- 1 Down
- The part of the earth's surface consisting of humus and disintegrated rock
- 2 Down
- The practice of cultivating the land or raising stock
- 3 Down
- Clear liquid we drink that falls as rain
- 5 Down
- An amount of something available for use (plural)
- 6 Down
- The work of finding and killing or capturing animals for food or pelts
- 7 Down
- Any instrument or instrumentality used in fighting or hunting (plural)
- 9 Down
- The yield from plants in a single growing season (plural)
- 11 Down