Answer:
In Death Valley, surfaces of 1.7 billion-year-old metamorphic rocks showing distinct convex-upward shapes are called turtlebacks.
Step-by-step explanation:
Turtlebacks in Death Valley refer to the unique geological features found on the surfaces of 1.7 billion-year-old metamorphic rocks. These rocks, shaped like the domed shell of a turtle, have convex-upward surfaces that are a result of complex geological processes over millions of years.
The term "turtlebacks" aptly captures the distinctive appearance of these rock formations, showcasing the intricate nature of Death Valley's geology. The convex shapes are believed to have formed through a combination of folding, faulting, and other tectonic forces that have acted upon the rocks in this region.