Choose an area of terrain no larger than 40 feet on a side within range. You can reshape dirt, sand, or clay in the area in any manner you choose for the duration. You can raise or lower the area's elevation, create or fill in a trench, erect or flatten a wall, or form a pillar. The extent of any such changes can't exceed half the area's largest dimension. It takes 10 minutes for these changes to complete. At the end of every 10 minutes you spend concentrating on the spell, you can choose a new area of terrain to affect within range. This spell can't manipulate natural stone or stone construction. Rocks and structures shift to accommodate the new terrain. This spell doesn't directly affect plant growth. The moved earth carries any plants along with it.