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<span> tsunamis, earthquakes, volcanoes, rivers, valleys, mountain formation, faults... </span>
Answer:
After three half-lives, it is 7:1
Explanation:
- The rate at which the decay of the radioactive isotope is said to be half-life and is represented as the half-life of the atoms and the matter to disintegrate itself.
- The two radioactive isotopes are K 40 and Ar 40. After the K-Ar dating, they contain minerals such as the clay mica and the temphra minerals and Half-life of the K 40 is 1.3 more than 100,000 years i.e 10x9 years for Ar 40.
- <u>Thus the K 40 has to divide as three half-lives have passed if the ratio of argon to potassium atoms is 7:1. At the end of one half-life, the ratio of the number of argon to potassium atoms is 1:1. and two half lives its 3:1 thus after the third half-life it becomes as 7:1.</u>
I think it would be B) northwest
That shows the most iron ore deposits which would mean that is probably where the most iron mines would be.
Answer:
Explanation:
1. Underwater volcano that never reaches above sea level
GUYOT
2. Underwater volcano whose top is eroded flat by waves
SEAMOUNT
3. Hot spring on rolling hills, this a dip between hills
SYNCLINE
4. volcanic neck break between rocks where a hanging wall rises relative to a footwall
REVERSE FAULT
5. Magma that filled the central vent that remains after the volcano has eroded
VOLCANIC NECK
6. Natural hot water on Earth's surface containing many minerals
HOTSPRING
7. A raised footwall block between normal fault creates this
HORST
8. Less than a mile in diameter; looks like a bowl at the top of a volcano
CALDERA
9. Over 1 mile in diameter; looks like a bowl over a volcano
CRATER
10.Created when a block with hanging walls slips down between normal faults
GRABEN