Barley. Grains remain an important part of the Russian economy.
Answer:
Costa Rica, Cuba, The Dominican Republic, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Puerto Rico, The United States has no official language, but since Spanish is widely spoken there, it is sometimes counted among the Spanish-speaking countries.
Explanation:
This is an example of an artificial reservoir, which can also be used for hydroelectricity.
<span>In terms of matter and resources, the Earth is essentially a closed system, because matter and resources are fixed.
</span>In terms of energy, the Earth is an open system, because there is a balanced transfer of energy. (The energy<span> radiates into the </span>Earth's system<span>, from the Sun and</span><span> then it is radiated back into space from the </span>Earth. The<span> flows of energy are regulated by the </span>Earth's<span> atmosphere and ozone layer.)</span>
