GEOGRAPHY HIGH SCHOOL

Radioactive decay of 40K atoms in an igneousrock has resulted in a ratio of 25 percent 40K
atoms to 75 percent 40Ar and 40Ca atoms.
How many years old is this rock?
(1) 0.3 10^9 y (3) 2.6 10^9 y
(2) 1.3 10^9 y (4) 3.9 10^9 y

Answers

Answer 1
Answer:

The age of the rock is mathematically given as

t= 2.6 10^9 y

What is the age of the rock?

Question Parameter(s):

a ratio of 25 percent 40K

atoms to 75 percent 40Ar and 40Ca atoms.

Generally, the equation for the half lif  is mathematically given as

t= \frac{ t_{ (1)/(2) } }{ln(2)} ln( ( K_(f) + ( Ar_(f) )/(0.109) )/( K_(f) ) )

Therefore

t= (1.251* 10^(9) )/(ln(2)) ln( (0.25+ (0.75)/(0.109) )/(0.25) )

t= 2.6 10^9 y

In conclusion,  the age of the rock is

t= 2.6 10^9 y

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Answer 2
Answer: Radioactive decay of 40K atoms in an igneous rock has resulted in a ratio of 25 percent 40K atoms to 75 percent 40Ar and 40Ca atoms. this rock 2.6 10^9 y years old. The answer is number 3. The rest of teh choices do not answer the question above.

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Answers

Answer:

no...

Explanation:

Which of the following is not one of the five zones of the deciduous forest?a. shrub
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Answers

The animal is not one of the five zones of the deciduous forest

Explanation;

There are 5 layers (also referred to as zones or strata) within the temperate deciduous forest. These  are
 Tree stratum, the tallest layer, sixty -100 feet high, with giant oak, maple, beech, chestnut, hickory, elm, basswood, small tree or tree layer - short tree species and young trees.
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Herb layer - short plants.
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The animal is not one of the five zones of the deciduous forest.

Further Explanations:

Deciduous forests are the range of temperate forest subjugated by trees that loses their leaves every year, especially found in areas with warm humid summers and cool winters. These forests have a pronounced variety of plant species, characterized mostly in forms such as Lichen, ferns, mosses and other miniature plants found in the forest. Shrubs constitute the central level while hardwood trees like maple, birch, magnolia,oak,sweet gum, and beech make up the third level. The five different layers of deciduous forests are as follow canopy,herb, under story, shrub, and floor. Each layer is characterized by different flora and fauna.  

Some key characteristics of the soil and climate in a deciduous forest are as follow:

  1. They have a long, warm budding season among the four distinct seasons.  
  2. There is abundant moisture.
  3. The soil normally is rich.
  4. Tree leaves are organized in strata: canopy, shrub, and ground and Under story,

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Answer Details  

Grade: High School

Subject: Geography

Chapter: Deciduous forests  

Keywords:

Deciduous forests , temperate forest , summers ,cool winters, Lichen, ferns, mosses, like maple, birch, magnolia, oak, sweetgum, and beech, follow canopy, herb, understory, shrub, floor,

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Answers

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Answer:

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