Answer:
option (1) quartz
Explanation:
The rhyolite is an extrusive igneous rock.
The color of rhyolite is generally pink or gray with very fine grains.
The Rhyolite is composed of quartz, sanidine, and plagioclase,
It also consists of minor amounts of biotite and hornblende.
It has very high silica content.
Hence,
The answer is option (1) quartz
Chile, Argentina, Brazil, Paraguay
<h2>
Answer: Bolivia and Paraguay</h2>
Explanation:
A landlocked country is a country surrounded by land or lacking access to the sea or the ocean, and in South America there are two countries that have this characteristic: Bolivia and Paraguay.
This is considered a geographical disadvantage, as these countries must incur higher transportation costs in import and export, compared to other countries in the region. In addition, this fact separates these countries from the wealth and commercial activities that occur on the sea coast, such as fishing and maritime trade.
It should be noted that Bolivia previously had coastline and access to the Pacific Ocean, but lost this privilege in the Pacific War, which confronted it, along with Peru, with Chile.
Answer:
Convergent plate boundary is the boundary where two plates collide into each other. At those boundaries volcanic arcs and submarine volcanoes can be formed.
Explanation:
There are three types of convergent plate boundary:
1. <em>Oceanic-oceanic convergence</em>
That is the boundary where two oceanic plates collide. The one which is cooler and denser slides beneath another one. Example is Pacific and Mariana plates.
2. <em>Oceanic-continetal convergence</em>
That is the boundary where oceanic and continental plates collide. Oceanic plate is denser and it always slides beneath the continental. Good example is Pacific and South American Plate.
3. <em>Continental-continental convergence</em>
This is the boundary where two continental plates collide. This phenomenom is known as continental collision. very best example is collision of Eurasian and Indian plate.
At first and secound boundary types both volcanic arcs and submarine volcanoes can be formed. On contrary, third type is not related with volcanic formations, but only with seismic activity (earthquakes).
