Answer: Ice cores.
Explanation: Ice cores are commonly studied by scientists to find out what the climate was like decades and centuries ago.
Answer:
Atomic radius decreases when moving right across the periods of the periodic table.
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If the element fail to form bonds between them you and I wouldn't exist all the living forms are made up of complex organic molecules which are synthesized from inorganic sources starting from the fabric we wear to the food we eat everything is made up of complex organic molecules life wouldn't have originated on earth if elements wouldn't have formed any chemical bonds with each other.
Has it own shape
Has volume
Has mass