Answer:
used to date rocks and other objects based on the known decay rate of radioactive isotopes.
Explanation:
Different methods of radiometric dating can be used to estimate the age of a variety of natural and even man-made materials.
The two most abundant elements in the universe are HYDROGEN AND HELIUM. Hydrogen is the most abundant element followed by helium.
Hydrogen is the lightest of all element and the first element to be formed, followed by helium which has just two atoms.
Answer:
C. Both observation 1 and observation 2.
Explanation:
The heliocentric model states that the Earth and planets revolve around the Sun at the center of the Solar System.
Observation 1 was answered by Nicolas Copernicus, father of the heliocentrism, in 1543. The reverse effect is an illusion created because the Earth revolves faster around the Sun than Mars.
And observation 2 also is explained by the model because the rotation of the earth made that the Stars be closer to it at different times of the year.
I hope this answer helps you.
Answer:
Temperature
Explanation:
temperatures below 0 degrees celsius will turn water into ice
Temperatures 1 to 99 degrees celsius is water in liquid form
Temperatures of over 100 degrees celsius liquid turns into gas
Answer 1) The option B) Ba and O
Explanation : Barium and oxygen elements are the pairs which are most likely to be the part of polyatomic ion. As barium has +2 charge and Oxygen has -2 charge which will be settle once they form an polyatomic ion.
Answer 2) Oxygen and Carbon.
Explanation : Oxygen and carbon are the elements in nature which can combine with other elements and form a polyatomic ion. These are abundant in nature and can be easily form a polyatomic ion. Oxygenated and Carbonated polyatomic ions are found to be the most stable ions.
Answer 3) Option B) ![CN^{-}](https://tex.z-dn.net/?f=%20CN%5E%7B-%7D%20)
Explanation : The anion which contains the oxygen atom in its molecular formula can be called as oxyanion. In the given options
is the only option where there is no oxygen atom present in the molecular formula. Hence,
is the correct option.