Scorching is done by the heat of the sun.

Scorching refers to the process of burning or severely heating something. It is often associated with extreme heat that can cause damage or harm. In the given options, the heat of the sun is the most appropriate answer for what causes scorching. Let's explore this further:

Heat of the Sun:
- The sun is a massive ball of hot gases that emits enormous amounts of heat and light. The heat from the sun reaches the Earth's surface in the form of sunlight.
- When the intensity of sunlight is high, especially during summer or in tropical regions, it can cause scorching. The direct rays of the sun can be extremely hot and can burn or heat up surfaces.
- This intense heat can scorch the ground, causing it to become dry and cracked. It can also scorch plants, causing them to wither and die.
- Additionally, scorching can occur on human skin when exposed to prolonged periods of intense sunlight. This can lead to sunburns or even more severe sun-related conditions like heatstroke.

Other options:
- Water: Water is not responsible for scorching. In fact, water is often used to extinguish or cool down scorching surfaces.
- Earth: Although the earth can become scorching from the heat of the sun, it is not the cause of scorching itself. The sun's heat is responsible for scorching the earth's surface.
- Rain: Rain, which is the presence of water, is not responsible for scorching. In fact, rain is often associated with cooling down the environment after scorching heat.

In conclusion, scorching is primarily caused by the heat of the sun. The intense heat from the sun can burn or severely heat up surfaces, leading to scorching. It is important to protect ourselves and our surroundings from the scorching heat of the sun to avoid any potential harm.