Answer:
All of these indicate plates exist and move.
Explanation:
- The Ring of Fire, hot spots, and the locations of earthquakes draw a pattern on the surface of geologic activity underground.
- Seafloor spreading is proof of tectonic plates because it increases the area of some oceans and decreases the area of others. Magma from the mantle pushes the plates apart.
- The case of matching fossils in parts of South America and Africa is consistent with the theory that at one point the continents were joined together. According to seafloor spreading, the Atlantic Ocean is young and is still growing.
- The same principle applies to mountain ranges now found on two continents that used to be on the same one. It is thought that the Appalachian mountains were connected to Europe and Africa.
Newton’s first law states that motion stays the same throughout unless changed such as a football being placed on the ground and not moving it stays at rest and the football being thrown stays in motion unless changed by direction.
B I think but not 100% sure
Im guessing here but i think it's true
Answer:
<u>The effective nucleus charge increases on going from left to right.</u>
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Explanation:
There are two factors that determine the atomic size of the atom.
1. Shielding constant :It is the shielding of the outershell electron from the nucleus by the inner shell electron. Thses are repulsive forces.If the value of shielding contant is more , then the size of the element increases.
2.The Effective Nuclear Charge : The net attraction of the nucleus felt by the electron present in the outermost shell . It is represented by Zeff.
This is attractive force.
If the Zeff is more then the nucleus of the element will pull the electron cloud more strongly.This leads to decrease in the size of the element.
On going left to right ,each time one electron is added to the element .This electron attracts the nucleus more strongly<u><em>(the nucleus is Positive charge and the electron is negative charge, opposite charge attracts each other</em></u>). Hence , the size decreases.
Thus, in period two , there is decrease in the atomic radius with increasing atomic number because the effective nuclear charge increases on going from left to right.