Answer:
When the entire lake reaches 40 F, the surface water cools further, dropping below 40 F. Because this water is now less dense than the surrounding water, it will stay on the top and continue to cool. Once the surface water falls to 32 F, it freezes. The freezing then spreads downward into the lake and the ice thickens
Explanation:
Answer:
A nation that typically has higher average income, slow population growth, and many different types of economic activity
Explanation:
This is because a developed nation would be a nation that has been founded for more than 300 years (I think). They would have more population and economic activity due to the fact that it has been founded for a very long time. Meaning that growth and economic activity have been going on for centuries.
Answer:
service or tourism industries
Explanation:
The majority of the people in South America are working in the service and tourism industries. The continent in general is very attractive for tourists, and there's hundreds of millions of tourists each year, so it is no wonder that the service and tourist industries have a lot of employees. South America has a very interesting culture, beautiful nature, lot of well preserved ancient architecture, world renowned manifestations, great weather, long beaches, festivals, the largest rainforest in the world. This attracts people of with all sorts of interests in the South America, which is helping the economy of the continent immensely.
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.
I hope you find this information useful and interesting! Good luck!
