Sand dunes are formed by

volcanoes

erosion

convergent faults

divergent faults

Sand dunes are formed by erosion. If erosion did not occur, no rock cycle would happen. It would end up having large amounts of igneous, metamorphic and sedimentary rocks. No finer rocks can be found and no flat lands can be seen.

The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world. it involves making observations, formulating a hypothesis, and conducting scientific experiments.the steps of the scientific method are •observation-the first step of the scientific method involves making an observation about something that interests you•question-once you've made your observation, you must formulate a question about what you have observed. •hypothesis-once you've made your observation, you must formulate a question about what you have observed. •experiment-once you've developed a hypothesis, you must design and conduct an experiment that will test it.•results-the results are where you report what happened in the experiment. •conclusion-the final step of the scientific method is developing a conclusion.i hope that this you : )