c. older than
b. the same age as
d. not related to
Limestone is a sedimentary rock composed primarily of skeletal fragments of marine organisms. The presence of fossils reveals the biological origin of these rocks.
A limestone bed containing fossils that are 550 million years old is older than a bed of sandstone containing fossils that are 400 million years old.
Volcanoes in subduction zones form on the overriding plate as the subducting plate sinks beneath it. The subduction process creates deep ocean trenches where magma rises to the surface, forming volcanic arcs and mountain ranges.
In subduction zones, volcanoes typically form on the overriding plate as the subducting plate sinks beneath it.
When the subducting plate bends and plunges into the mantle, it creates a deep ocean trench. As the oceanic crust subducts, it begins to melt due to high temperatures and pressure. The melted rock, or magma, is less dense than the surrounding mantle, causing it to rise to the surface and form volcanic arcs or mountain ranges.
Examples of volcanic arcs formed in subduction zones include the Andes in South America and the Cascades in North America.
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Governments sprayed opium farms from the sky, killing the plants
Governments helped farmers start replacement crops
Governments did not get involved – and allowed farmers to grow whatever they pleased