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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Physics
Which statement best describes an igneous intrusion?

Magma is injected into surrounding rock forming an igneous intrusive
Magma is exported to an open area and forms iron
Igneous intrusion for when ice crystals splash into lava
Magma explodes to the surface and forms a smooth outer layer of rock

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