Ifa rock had 80 radioactive atoms in it when it was formed and it now has 20 radioactive elements in it, how old is the rock?

Answers

Answer 1

Answer:

100, it is 100 years old

Explanation:

Answer 2

Answer:

10 million years

Explanation:


Related Questions

Point A is to the left of Point B on a horizontal number line.

What could be the values of Point A and Point B ?

Answers

Answer:

Point A could be any number that is lower than point B.

Explanation:

Since A is to the left on a number line it is lower then the number to the right (point B)

Some examples of numbers are A=2 and B=6

A can be any number lower than b

challenge where is my location im in the south east region and im right below Georgia
and i have great beaches and have the second largest coastline if u get right brainliest

Answers

Answer:

the answer is florida

Explanation:

Florida is the answer!☀️

Lina applies a constant force of 30 N as she pushes a dresser 3 m. How much work did Lina do on the dresser

Answers

Answer:

srry

Explanation:

Is there any choice. I think I know the answer but I need to make sure

What is the difference between refraction and reflection?

In refraction, light travels from one medium to another.
Refraction only happens in liquids.
In reflection, light travels from one medium to another.
Reflection only happens in a liquid.

Answers

Website said the first one lol.

Refraction of waves is a change of direction as they pass from one medium to another
I believe it is the first one

Many people in South America are subsistence farmers. Subsistence farming is...
A
growing only enough crops for food to fed the family.

B
focusing on growing cash crops to sell to make money.

C
growing only one type of crop.

D
growing crops in higher elevations.

Answers

Answer:    

A: growing only enough crops for food to feed the family.

Explanation:    

Substance farming is farming just enough to sustain someone.

I hope this helped <3

A. Growing only enough crops for food to feed the family

Subsistence farmers also use any surplus of crops for trade or sale

Which of the following is not one of the three branches of government in Australia and New Zealand?
A.
judicial
B.
legislative
C.
republican
D.
executive
PLZ HURRY!!

Answers

Answer:

republican

Explanation:

just looked it up

Republican, and you can find it on the Internet

PLEASE HELP! DUE SOON!! I'll give Brainlest!
Describe how ice wedging and plant roots are similar in breaking rocks down.

Answers

Answer:

they are similar because a plants roots go in the cracks in a rock and as it grows it physically breaks apart the rock and when it is cold and it rains the water seeps down into the cracks and as it freezes it expands causing the rock to physically break apart

Explanation:

so they are similar because they go into the cracks in rocks and slowly expand causing the rock to break apart

There are a number of physical weathering processes that break earth materials apart, a very common one is called root wedging. Plant roots work their way into rock crevices called joints. ... Frost wedging occurs when water freezes in rock fractures

Which objects would cause refraction of light?

eyeglasses
wooden box
magnifying glass
prism

Answers

Eyeglasses and magnifying glass.

Because, it’s the glass that causes the refraction off e light.
Eye glasses and magnify glass

How many half-lives did the rock go through? 4. If a rock had 40 daughter atoms present, how old would the rock be?

Answers

160 I would say hope this helped
160 should be the right answer

help ill give brainliest

Answers

Answer:

Hey i did oddsywhere too lets see here

Explanation:

eating large quantities of fallen fruit and viable seeds. i think

the other person who answered is rigjt

How many half-lives did the element go through?

Answers

Answer:

7

Explanation:

I might be wrong you didn't give much information.

This might help it’s a chart

Which of these colors are the main colors of visible light?

peace
pink
gold
red
violet
indigo
green

Answers

The main colors of visible light are
Red, green and blue

Answer:

Red ,green and blue

Explanation:

that are the answers.hsve lovely day

100%
How does freezing water cause the weathering of rocks?
A. holds them in place
B. makes them longer
O
C. cracks them
0
D. makes them thicker
o
E.makes them heavier

Answers

Answer:

The answer is C.

Explanation:

That process occurs when the water inside of rocks freezes and expands. That expansion cracks the rocks from the inside and eventually breaks them apart.

Hope this helps! <3

Answer:

I think it's d

What are the three primary colors of light? (Select three.)

violet
indigo
blue
red
green
yellow

Answers

the three primary colors of light are red, green, and blue.
Red, blue, and yellow!!! :)

Which of the following describes something that oceanographers study?
contours and formations
soil conservation
gravity fields
formation of groundwater

Answers

formation of groundwater i think

Answer:

Formation of groundwater

Explanation:

Savannah’s location contributed to the city’s early economic success because it enabled the city to

Answers

unfinished question :/ can’t answer w/o other information
It enables the city to GROW

does confining stress increase volume

Answers

No I do not believe confine stress increases volume but I’m not sure

Answer:

Confining pressure affects brittle fracture strength by suppressing the growth of dilatant microcracks.

Explanation:

What is the average salinity of sea water?
3.5% salt and other minerals
4.2% salt and other minerals
2.4% salt and other minerals
3.0% salt and other minerals

Answers

The average salinity of water is approximately 3.5%, or 35 parts per thousand.

This implies that for every 1 litre of sea water there are 35 grams of salts dissolved in it.

Even though a vast majority of seawater is found in oceans with salinity around 3.5%, seawater is not consistently saline throughout the world.

The answer you’re looking for is
A. 3.5
Enjoy the rest of your day/night :)

True or False: 100 year old soil has less nutrients in it than 20 year old soil.

Answers

True because Steadily and alarmingly, humans have been depleting Earth's soil resources faster than the nutrients can be replenished

Answer:

False.

Explanation:

HELP ASAP I AM DEAD INSIDE

Answers

Colorado river is your answer I believe
A I’m 100 percent sure

According to geographers’ estimates, two out of three people in the world will live in a city by the year 2030. This migration to urban centers creates an increase in urban populations, resulting in the formation of megacities. Geographers define a megacity as any city with a population of more than 10 million people. Today, there are 25 megacities in the world.

Explore this resource on megacities, clicking through the interactive and reading about a few megacities in the world. Then pick two cities, research them, and create a profile about them. For each city, include the following information:

location
brief history of the city
population density
problems currently facing the city
what city planners are doing to address the city’s problems
what city planners could be doing differently

Answers

Just look up 2 mega cities (question)
So like New York City location
New York City brief history
New York City population density
Hope this helps.

Answer:

dude i have this same question and im overrrr it

Explanation:

Hey can anyone come help with this?

it's actually pretty easy but ima still ask

Answers

Its capacity to store body fat to survive periods of food shortage
Answer (The capacity to store body fat to survive periods of food shortage)

Hope this was helpful :) have a nice day !

What type of relationship does the Cook Islands have with New Zealand, and how does it benefit from this relationship? plz have at least 5 sentances.

Answers

Answer:

The Cook Islands is a representative democracy with a parliamentary system in an associated state relationship with New Zealand. Executive power is exercised by the government, with the Chief Minister as head of government. Legislative power is vested in both the government and the Parliament of the Cook Islands.

Explanation:

The Cook Islands is a representative democracy with a parliamentary system in an associated state relationship with New Zealand. Executive power is exercised by the government, with the Chief Minister as head of government. Legislative power is vested in both the government and the Parliament of the Cook Islands.

Yeah always works out in the end to be honest

By what process in the water cycle does water return to the land?
transpiration
precipitation
evaporation
sublimation

Answers

i think the answer is transpiration
precipitation is the answer
Other Questions
Divisional income statements do not have to follow generally accepted accounting principles (GAAP) because they are internal reports. True False For each situation, write an expression answering the question. The expression should onlyuse multiplication,a. A person's salary is $2,500 per month. She receives a 10% raise. What is her new salary,in dollars per month?b. A test had 40 questions. A student answered 85% of the questions correctly. How manyquestions did the student answer correctly?C. A telephone cost $250. The sales tax is 7.5%. What was the cost of the telephoneincluding sales tax? how do you think the idea of sustainability influences the work of foresters?help me Can someone please recomend a tearpuller or heartfelt book to me? :D -6 - x = -4 What's the value of x? Please show your work. Vocabulary: How are integers and their opposites related? Select all that are true. A student is trying to determine the density of a piece of metal. She uses a balance and finds that the mass of the piece of metal is 15.36 g. To determine the volume of the metal she fills a graduated cylinder to 30.0 mL and then drops the piece of metal into the graduated cylinder. The final volume of the metal 34.1 mL. What is the density of the piece of metal Where is Europe located in relation to the United States? What about the location of New York state makes it a good location for trade between the United States and Europe? triangle ABC has perimeter 22cmAB= 8cmBC= 5cmby calculation deduce whether triangle ABC is right-angled triangle Select three ways that fluid power systems are becoming more efficient.implementation of microstructuresdecreased fuel powerincreased carbon emissionsreduction of valvesinstallation of regenerative braking please help and show work if you can 20 points and will mark brainliest!! Explain how you got it! Find the slope of the line that passes through the points (-2, 6) and (9, -5). Pam and Ralph work at a factory with a labor union. Pam and Ralph may have to trust another person to negotiate their wages attend training during unpaid overtime reduce working hours to increase productivity have their wages garnished to avoid unemployment What most likely led to this population increase among Blacks between 1650-1760?a. The success of the tobacco industry and need for labor . the Colonists discovered that com grew well in South Carolina c. The need for indentured servants continued to grow d. Slaves from South America and the Caribbean were seeking refuge Someone help me match the last two to their definition Hypotonic and Isotonic I will give BRAINLIEST!!!! Which of the following is the enharmonic note for the note shown above? what is the rule for the reflection Help please & thanks! PLEASE HELP ME dhdjdbjfjf