Ella filled a bucket 7/10 of the way with water. she then poured out 2/10 of the water. how much water remains in the bucket?

 The water that remains in the bucket is

Explanation:

Let the total quantity of water that can be filled in the bucket be x litres

then, volume of water when ella filled it up =

amount of water taken out post that =

amount of water left in the bucket = amount of water when ella filled it up  - amount of water taken out post that =

Thus water remains in the bucket is

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.