18
Explanation:
The family number 18 consists of a pool of elements that are less likely to enter into chemical reactions. They are called noble gases or inert gases.
They do not react with other elements.
These elements are:
Helium
Neon
Argon
Krypton
Xenon
Radon
- inert gases do not react because their outermost shell is completely filled.
- most elements combines in order to fill their outermost shell completely
- for noble gases, this is completely done already
- all atoms on the periodic table tends to mimic them when they go into chemical reactions.
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Answer:
C Department of the Interior
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The reason there are four seasons is that the earth is tilted 23.5 degrees on its axis. For half the year, this tilt causes one half of the earth to tilt toward the sun while the other half tilts away. This changes every six months, creating the seasons.
Answer:
Option D, erosion, deposition, compaction, cementation
Explanation:
Sedimentary rocks are formed from the eroded soil. Therefore, erosion is the first step in formation of sedimentary rocks.
The eroded soil or rock is carried by carrier agents such as wind, water etc. and deposited at some place where it gets compacted under its own weight. After deposition and compaction, physio-chemical processes take place to produce chemical bonding between the deposited granular particles. Chemical interactions causes cementation of the compacted material
Hence, option D is correct
both species had growth in number within the same time period
