Answer:
<h3>sand is a substance: because is a mixture of two or more material which are not completely comband tougher but are phsicla comband tougher</h3>
It changes the way the earth looks and the resources we are available to
Answer:
Sunlight
Explanation:
Sunlight is not provided 24 hours a day so during nightfall solar panels will not have the ability to collect energy.
Friction creates heat between two objects rubbing together, and slows the moving object down.
Answer:
La fricción, fuerza de roce o fuerza de rozamiento es una fuerza existente entre dos superficies que se encuentren en contacto, y que se opone al movimiento, o sea, tiene dirección contraria al movimiento.