Growing tomato plants in your garden provides juicy and plump fruit without having to make a trip to the market. Unfortunately, blight and powdery mildew can attack the tomato plants, causing stunted growth, leaf discoloration, premature leaf dropping and discolored spots on fruits. Several natural remedies will help control these diseases without using toxic and harsh fungicides.
Broadly, there are two kinds of networks effects: Direct network effects: An increase in usage leads to a direct increase in value for other users. For example, telephone systems, fax machines, and social networks all imply direct contact among users. A direct network effect is called a same-side network effect. An example is online gamers who benefit from participation of other gamers. Indirect network effects: Increases in usage of one product or network spawn increases in the value of a complementary product or network, which can in turn increase the value of the original.
Definition of greenhouse effect for Students : warming of the lower atmosphere of the earth that occurs when radiation from the sun is absorbed by the earth and then given off again and absorbed by carbon dioxide and water vapor in the atmosphere