At a Subduction Zone,the Downgoing (Subducting)plate ____________

question 18

Multiple Choice

At a subduction zone,the downgoing (subducting) plate ____________.

• A)is always composed of continental lithosphere
• B)is always composed of oceanic lithosphere
• C)may be composed or either oceanic or continental lithosphere

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Definitions:

Psilotum

A genus of fern-like plants that belongs to one of the oldest groups of vascular plants, providing insights into the early evolutionary history of plants.

Herb

A plant with leaves, seeds, or flowers used for flavoring, food, medicine, or perfume.

Exaptation

An exaptation is a trait that initially carries out one function and is later co-opted for a new function. The original function may or may not be retained.

Tiktaalik

An extinct genus of fish-like tetrapods that represents an early stage of the transition from fish to tetrapods.