The set up below was used to calibrate a thermometer. observed
(lm:
Ice
manometer
steam
steam
1
boiling water
3
n
Which temperature was being marked with the use of the first set up? (l mark)
) Why should the ice be pure?
(l mark)
1) Why should the thermometer be on steam and not dip in the water when
determining the upper fixed point
(l mark)​

ice, and the 2nd question I'm not sure

that is a club

explanation:

i am good at it i think hope its right

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.