Answer:
(C) ocean floor
Explanation:
The protolith or parent rocks that forms schists are basically mudstones and shales. These are clastic sedimentary rocks that are rich in fines(clay sized particles).
Most shales are usually formed in deep ocean floors because larger sized clastic sediments cannot reach these environments. Winds and waves acts as active agents to deposit fines on the ocean floor.
Since shales are predominantly made up of clay minerals which are products of micas that have been chemically altered, we expect these clay minerals which are hydrous(contains water) to revert back to mica under metamorphic conditions.
As metamorphic transformation progresses under intense pressure and temperature and also minerological transformation, our rock moves from slate, to phllylite and then to schists.
Slate is a low grade metamorphic rock that is usually fine grained and foliated. As metamorphism increases, mica begins to grow and a shiny lustre appears in the rock, a phyllite results. Schists have larger mica grains and are foliated also.
Desert dunes are mostly made of sandstones. Their metamorphic transformation yields quartzite.
Coral reefs ar made up of rich calcite deposits and would form a metamorphic rock known as marble.
Answer:
Option: a. 200 million years ago
Explanation:
Million years ago, Earth had one supercontinent called Pangaea and surrounded by an ocean (Panthalassa). Alfred Wegener proposed the concept of one big continent after putting together different records of confirmation. He was able to give his theory by examining fossils of plants, trees, animals, and reptiles that found in different continents. About 200 million years ago, the supercontinent began to split up into two parts; Gondwana from Laurasia. Today's countries, including Africa, Antarctica, India, South America, and Australia are part of Gondwana, where Europe and North America from Laurasia.
Answer:
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<h2>
Answer: open</h2>
The image represents an open star cluster.
Open star clusters are groups of stars formed from the same molecular cloud, generally asymmetric (without structure).
An important characteristic of this type of cluster is that all its stars have the same age and similar chemical composition. In addition, they are linked to each other gravitationally, but to a lesser extent than those of globular clusters.
The stars hosted by these clusters tend to be young, massive and very hot.
Among this group are the Pleiades (represented in the image), located in the constellation of Taurus.
