Physics
Mud houses are cooler in summers and warmer in winters as compared to brick houses because

Mud is a poor insulator
Mud is a bad conductor
Evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Mud is a good conductor

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

the friction between sand and feet is more than that between concrete and feet.
the friction between sand and feet is less than that between concrete and feet.
sand is soft and concreter is hard.
the sand is grainy but concrete is smooth.

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