Which of the following statement(s) is correct?

I.  Boiling and evaporation are simultaneous processes.

II.  Without boiling, evaporation cannot occur.

III.  Evaporation is independent of boiling.

IV.  Evaporation is more in windy day.

Which of the following statement(s) is correct?

I  Evaporation takes place at 100 °C.

II Evaporation takes place at all temperatures.

III Condensation occurs at all temperatures.

IV Condensation and evaporation occur at the same time.

Look at the water cycle below and answer the question that follows:

What change of state does X undergo to form clouds?

Choose the correct reason.

Though thunder and lightning occur at same time, flashes of light can be seen before we hear the thunder.

Choose the correct reason.

Groundwater is more pure than the waters of rivers and ponds.