There is a material on Earth that undergoes a very long, and sometimes violent, cycle.
This material can begin as a solid on the surface of the Earth. Weathering can then break the material up into pieces, and erosion
can transport the pieces to ocean bottoms. Eventually, the material reforms as these pieces are cemented together.
Over time, the material is gradually pushed into the Earth's interior. Heat from inside the Earth can then cause the material to melt
Eventually, the melted material returns back to the surface through volcanic eruptions. At the surface, the material cools and tums
solid once again
What is this material?

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Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

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Answer trigonal pyramidal;