Help Pl What is the difference between magma and lava?

A Magma is molten rock within the earth; lava is molten rock on the earth's surface.
B Magma is cool, lava is very hot.
Magma is very hot, lava is cool.
D Magma is molten rock on the earth's surface; lava is molten rock within the earth.

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

gas

explanation:

smoke is the matter of a gas

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

the answer is d.) potassium