Natural. At least that was what my teacher said.
The kind of economy that was instituted under Joseph Stalin is a command economy<span>. A command economy is a type of economy where the government, rather than free market, determines what goods should be produced, how much should be produced and the price at which the goods are offered for sale.Joseph Stalin was the leader of the USSR from 1924 to 1953. He realized that his country was going to no where without industrialized, thus found the need of creating a command economy. </span>
I think the common between low-latitude countries would be people's skin color and If you compare the Philippines and its neighboring countries, they have more or less similar physical attributes. Typical Filipinos looked similar with Indonesians.
For Southeast Asia, i would also consider religion is common between the two. Both the Philippines and the other Southeast Asian countries such as Indonesia, Malaysia, and Thailand, they have a large number of Muslim settlers while other tropical countries in South America, these countries have similar Spanish ancestry just like the Philippines.
A primary pollutant is an air pollutant emitted directly from a source.
A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere.
Examples of a secondary pollutant include ozone, which is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine in the presence of sunlight; NO2, which is formed as NO combines with oxygen in the air; and <em><u>acid rain</u></em>, which is formed when sulfur dioxide or nitrogen oxides react with water.
Hope this helps:)
I think that you got it right that is what we did in science class to test that out :)
