Answer:
Percolation of water through the soil.
Explanation:
When a tray containing a mixture of dough and sand is propped on one end of the tray with bricks then there is a slope from one end of the tray to the other end of the tray.
When water is poured on the higher end of the tray then the it tries to flow from the higher altitude to the lower altitude of the tray by the process of percolation through the granular spaces created due to the mixing of sand in the dough. Sand being granular in structure is easily permeable to water and passes water easily through its tiny pores.
Similar is the process of percolation of water through the layers of soil on the earth which also contains granular particles in them.
Answer:
Black is the result of absorbing all colors with different wavelengths. No light is reflecting off it that we can see. So we can see it in white because as far as our eyes, there is just enough contrast in the light against the white for the print to be visible.
After the waxing gibbous, the lunar phase is the full moon so the answer is A.