In contrast to mechanical waves, electromagnetic waves can travel without a medium. This implies that electromagnetic waves can pass not only through solid objects like air and rock but also through empty space.
James Clerk Maxwell, a Scottish scientist, created a scientific theory to explain electromagnetic waves in the 1860s and 1870s. He realized that electromagnetic waves can be created when magnetic and electrical fields combine together. He compiled this electricity-magnetism relationship into what are now known as "Maxwell's Equations."
German physicist Heinrich Hertz used Maxwell's theories to explain how radio waves are transmitted and received. In honour of Heinrich Hertz, the hertz, or one cycle per second, is the unit of radio wave frequency. Two issues were resolved by his radio wave experiment. First, he had proven that the speed of radio waves was the same as the speed of light, which was something Maxwell had only theorized.
This demonstrated how radio waves are a type of light. Second, Hertz discovered how to create electromagnetic waves by causing the electric and magnetic fields to separate from wires.
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The correct answer is:
Passionate and logical.
The Founding Fathers, wrote the Declaration of Independence. This document was logical, yet not intellectual. Passionate, yet not personal. It was very simple. Well thought out, but simple. It was constructed that way so that even simple minded could understand. It was logical in all it's aspects. For instance, the text states, "whenever any form of government becomes destructive of these ends, it is the right of the people to alter or to abolish it, and to institute new government."
Answer:
export more than it imports
Explanation:
The colonial powers during the seventeenth century were led by the economic principles of the mercantilism. This economic principle was basically suggesting that in order for a country to gain as much wealth as possible, it needs to produce a lot, export more than it imports, and use protectionism as a defense mechanism. In order to accomplish this, the colonial powers engaged into mass production of goods that were in high demand and were sold for good price, resulting in creation of enormous plantations of cash crops. Some of the cash crops that contributed to accumulation of wealth through trade were the sugar cane, cotton, indigo, tobacco etc. Something else that this economic principle suggested was the creation or opening up of new markets, and the result of that was conquering new territories, where both the resources were used, and it was a new market for the products, though this came slightly later in the history.
The tiny invaders being discussed in the article are plants. They are considered invaders because they came from other countries, but are now threatening the native plants. People brought them in because they wanted to make their gardens and yards beautiful because the plants are very rarely found locally.
