Final answer:
The water table is higher beneath hills than beneath valleys in humid climates, and after it rains, the water table sinks very slowly due to the slow recharge process.
Step-by-step explanation:
The answer to the question 'The water table is ________ beneath hills than beneath valleys in humid climates. This is because the water table sinks ________ after it rains.' is c) higher / very slowly. In humid climates, the water table is generally higher beneath hills and lower beneath valleys. This occurs because hills represent areas of accumulation where water infiltrates more efficiently, and valleys often correspond to discharge areas.
After it rains, the water table sinks very slowly. This is due to the gradual movement of water through the unsaturated zone referred to as recharge. The movement of underground water depends on the porosity and permeability of the soil and underlying geological structures, which can often result in a slow descent of the water table after significant rainfall events.