A narrow region between two air masses of different densities is a

Convection currents are responsible for powering the movement of tectonic plates.

Answer:

The answer is: volcano.

Explanation:

The mid-ocean ridges are underwater elevations located in the middle part of the Earth's oceans.

The chain has a very rugged relief, with wide slopes and ridges often marked by a deep longitudinal recess, called the sinking or rift valley, along which numerous surface earthquakes and volcanic eruptions occur that pour basalt lavas.

The answer is: volcano.

A nitrogen atom contains 7 protons, 7 electrons and 7 neutrons.

What are Electrons, protons and Neutrons?

Electrons are defined as subatomic particles with a negative elementary electric charge that belong to the first generation of the lepton particle family, and are considered elementary particles because they have no known constituents or substructures.

A proton is defined as a stable subatomic particle, symbol p, H⁺, or ¹H⁺, having a positive electric charge of +1 e elementary charge, with a mass slightly less than that of a neutron and the mass of an electron is 1,836 times.

A neutron is defined as a subatomic particle found in the nucleus of every atom except simple hydrogen, where the particle derives its name from the fact that it has no electric charge as it is neutral. Neutrons are very dense. Atoms contains same number of protons, electrons and neutrons like in nitrogen.

Thus, a nitrogen atom contains 7 protons, 7 electrons and 7 neutrons.

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Answer: C) Unscrew one light. If the other lights turn off, it's a series circuit.

Explanation:

In a series circuit, all the components in the same path. The current in the entire circuit is same. The voltage drop across each component is different. If one component does not work, the entire circuit breaks and other components also stop working. On the other hand, in a parallel circuit, voltage drop across all the components is equal. Trouble in one component does not effect other components.

Hence, to check whether the lights are connected in series or in parallel, one light should be unplugged and if the other lights still work, it means they are connected in parallel otherwise in series. Thus, correct option is C) Unscrew one light. If the other lights turn off, it's a series circuit.

Voltage difference causes charge to flow from higher potential to that of a lower potential.

What is Potential difference?

This is also known as Voltage difference and it is the difference in electric potential between two points.

V= W/Q

where v is potential difference, w is work done and q is charges.

This allows for charges to flow from higher potential to that of a lower potential.

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Answer:

Voltage difference causes charge to flow from higher potential to that of a lower potential.

Explanation:

Voltage Difference:

It is work done per unit charge in moving a charge from one point to another point.

V = Voltage difference

W = Work done

Q = Charge

Then,

unit : Volt or Joule/Coulomb

Flow of charge :

A free positive charge move from a region of higher potential to that of lower potential whereas a free negative charge moves from lower potential region to a higher potential.

Thus, a voltage difference is required for the flow of charge.

Direction of conventional current is from positive terminal to negative terminal.

Direction of electron is from negative to positive.