100 points to whoever answers these questions!

Biology

1 answer:

sesenic [268]3 years ago

5 0

7) When there is pressure, tectonic plates can shift, which moves some of the lithosphere. It cooperates with the mantle of the Earth because the crust floats on top of it.
8)Magnets have a north and South Pole. Opposites attract while similar poles repel. Magnets can be cut in half and still have a north and South Pole. The earth is a magnet.
9) Compasses are magnets that have an attraction towards the Sun. By observing the time, the Suns position in the sky, and a compass, people can navigate much easier.
10) The steepness of the platform, the height of the platform, and the weight of the object.
12) Heat can travel in 3 ways; conduction, the transfer of heat through physical touch, such as touching a hot metal spoon; convection, there transfer of heat through liquid or gasses, and radiation, the transfer of heat through waves. An example of radiation is the heat from the sun or a fire.

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Answer:

As the area of negative charge at the base of the thundercloud builds up, it induces a region of positive charge to develop on the ground below. As a result of this, a potential difference or voltage is created across the cloud-to-ground gap. Once the voltage reaches a certain strength, the air between the base of the cloud and the ground develops an electrical conductivity. At first a channel, known as a stepped leader, is formed. Although invisible to the naked eye, this allows electrons to move from the cloud to the ground.

It is called a stepped leader because it travels in 50 to 100 m sections, with a slight pause in between, to the ground. As it nears the ground, a positively charged streamer fires upwards from the ground to connect with it. Streamers are most often initiated from tall objects on the ground.

Once connected, electrons from the cloud can flow to the ground and positive charges can flow from the ground to the cloud. It is this flow of charge that is the visible lightning stroke.

After the first discharge, it is possible for another leader to form down the channel. Once again, a visible lightning stoke is seen. This can happen 3–4 times in quick succession. All of this happens in a time interval of about 200 milliseconds.

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