i. Objects solidify in the inner core of the earth because of the high pressure and temperature. The inner core is located at the center of the earth and it is made up of solid iron and nickel. The pressure in the inner core is so high that it prevents the iron and nickel from melting, despite the high temperatures that are present. This is why the inner core of the earth is solid, even though it is the hottest part of the earth.
ii. Soil erosion and deposition are simultaneous processes because they are both part of the same cycle. Soil erosion occurs when soil is moved from one location to another by wind, water, or other forces. Soil deposition occurs when soil is deposited in a new location. These two processes are part of the same cycle because the soil that is eroded from one location is deposited in another location. This cycle can repeat itself many times over thousands or millions of years.
iii. The sun is the main source of heat and light because it is a giant ball of gas that undergoes nuclear fusion. The nuclear fusion reactions in the sun's core release a tremendous amount of energy in the form of heat and light. This energy is then radiated outwards from the sun's surface and travels through space to reach the Earth. Without the sun, the Earth would be a cold, dark, and lifeless planet. The sun's energy is essential for life on Earth, as it provides the energy that drives the processes of photosynthesis and the water cycle, among others.