The matter of the sun
a. forms a defined outer boundary.
b. is made of superheated gas.
c. has a negative electrical charge.
d. has a maximum temperature of 1 million°C.

b. is made of superheated gas.

Explanation:

Most atoms in the Sun exist as plasma, or a fourth state of matter made up of superheated gas with an electrical charge which is both positive as well as negative.  Our Sun consists almost entirely of the elements hydrogen and helium. ... The core is plasma, but moves similarly to a gas.  Its temperature is around 27 million degrees Celsius.  And because the Sun is not solid, it does not have a defined outer boundary.

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here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.