Extra credit dra w a picture of sand dunes and show the direction of wind forming the dunes. using labels and arrows.

the answer to your question is c

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

answersilicon (si); oxygen (o);

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.