The youngest geologic unit visible in the cross section is the ____________. 
Definitions:
Crowdsourcing
is the practice of obtaining ideas, services, or content by soliciting contributions from a large group of people, especially from an online community.
Innovative Ideas
Original and creative concepts that bring new solutions to problems or introduce unique improvements.
Developing
The process involving growth, advancement, or improvement in skills, knowledge, or capabilities.
Implementing
The process of putting plans, strategies, or policies into action or effect to achieve specific goals or outcomes.
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