Why do pigs toil in the mud during hot summer?

Why does evaporation ause cooling?

Aakash noticed that the metal latch on gate was difficult to open during hot sunny days. However, this same latch was not difficult to open at night. Aakash observed that the latch and the gate are exposed to the sun during the day. a) Formulate a hypothesis based on the information provided.

Choose the term that does not belong in the following group and explain why it does not belong? Notochord, cephalisation, dorsal nerve cord and radial symmetry.

Why does blowing over a spoonful of hot tea cools it ? Does evaporation play a role ? Does radiation play a role ?

Why do people prefer wearing white clothes during summer?

Explain the following observations Aerated water bottles are kept under water during summer

(a) Why does the reaction rate of a reaction increase on raising the temperature? (b) Explain the types of double displacement reactions with examples.

Explain why Ca(OH)_(2) is used in white washing .

A student was asked a question 'why are there summer and winter for us? He replied as 'Since Earth is orbiting in an elliptical orbit, When the Earth is very far away from the sun (aphelion) there will be winter, when the Earth is nearer to the sun (perihelion) there will be winter' .Is this answer correct? If not, what ie correct explanation for the occurence of summer and winter?