The answer is B because it’s asking for the PHYSICAL geography study.
The right option is; B. a physical boundary between France and Spain
Pyrenees are various mountains situated in southwest Europe. Pyrenees forms a physical boundary between Spain and France while Andorra (a small country) is located between them. Pyrenees covers about 267 miles from the Bay of Biscay to the Mediterranean Sea. The eastern area of the Pyrenees are mostly made up of rocks (granite and gneissose), while in the western area, the top of the granite contains layers of limestone.
Answer:
-The theory of plate tectonics states that the Earth's solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere
divergent- plates move away from each other
convergent-plates collide
transform- plates slide sideways past each other
-Magma from the underlying mantle erupts at the edges, then cools and solidifies to form new ocean crust.
Answer:
E. Mineral content
Explanation:
Viscosity is an internal property of a fluid that offers resistance to flow, the nature of volcanic eruptions is highly dependent on magma viscosity and also on dissolved gas content (dissolved gases become trapped by thick magma and the magma chamber begins to build pressure).
The viscosity of magma is controlled by the size of the molecules that comprise it.
<em>Felsic lava contains elements of small size (sodium and aluminum), these elements form polymers and large crystalline macromolecules like silica, the more extensive silicate chain molecules the more viscous the magma becomes, this happens because larger molecules have stronger intermolecular bonds preventing movement and spreading. </em>
Mafic and ultramafic lava, on the other hand, have lower viscosities, also contain lower quantities of silica and aluminum and are rich in magnesium oxide, which does not form large molecular structures, therefore lava flows smoothly, unrestricted by intermolecular forces.
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