use the periodic table to identify an element is by looking for the element's name or elemental symbol.
It is 20 because then you will put 30 inside of 20milimeeter and put 70 years into the other pint and put it learnt into the cup
Carbon Dioxide is a compound gas
Carbon Dioxide is a gas produced by burning carbon and organic compounds and by respiration.
The Arctic Ocean is likely to have its first ice-free summer before 2050
Remains the same because temperature can't change energy