It is illegal to alter someone else's check.
A surveyor is someone who measures Earth's elevation and leaves plaques called bench marks. Benchmarks are surveyor leave that tell the exact elevation of a place.
BTW this is about someone with multiple personality disorder
Spoofing. Impersonating
When someone, like a monarch or a Pope, leave his position it is called a resignation.
alter bridge
deform
You cannot alter someone's thinking. The way someone thinks is purely their way.
The type of weathering that does not alter the chemical composition of the rock is called physical weathering. The acid weathering usually alter the chemical composition of a rock.
Chemical substance that alter perceptions and mood are called Psychoactive Drugs.
To alter the intonation of someone's voice, they would require voice therapy or voice training. This is a non-surgical method of improving or modifying someone's voice tone.
The leaves of conifers are called 'needles'