Rock Layer E is 250,000 years old. Rock Layer C is 200,000 years old. Rock layer C has not undergone radioactive decay and has 18 radioactive isotopes. The half-life is 50,000 years. Rock Layer E has undergone radioactive decay ONCE, how many daughter and parent isotopes are present in layer E?
Answer:
Explanation:
By definition, after a radio active decay, a parent isotope will create a daughter isotope.
Layer C is exactly one half-life from Layer E at 50000 years. So half of the original parent isotopes from Layer E would have decayed to form daughter isotopes. As C has 18 radioactive isotopes together, E should have 6 daughter and 6 parent isotopes.
Answer:
Explanation:
Rock Layer E is 250,000 years old. Rock Layer C is 200,000 years old. So the two layers are off by 50,000 years; equal to one half-life.
As Rock Layer E has undergone radioactive decay ONCE, each parent isotope forms one daughter isotope after the decay.
Rock layer C has not undergone radioactive decay and has 18 radioactive isotopes. So that represents an equal number of parent and daughter isotopes, i.e. 9 parent and 9 daughter isotopes.
So there are 9 parent and 0 daughter isotopes in layer E.
Help pls i dont have time 25. What is the average rainfall for each ecoregion?
26. Based on the highest part of the rainfall average for the ecoregions, which 4 ecoregions
had the highest amount of rain?
Answer:
its c because 7 x 9=90+7=900
Explanation:
your welcome man
common factors of 72
Answer:
The common factors of 72 are
1,2,3,4,6,8,912,18,24,36,and72help
tee RN Eric rich job
Answer:
Doctors search for new medicine
environmental groups leave the forest alone
native Americans preserve the forest
ranchers expand cattle farming
Which current has a cooling effect on the climate of the west coast of South America?
(1) Falkland Current
(2) Peru Current
(3) Benguela Current
(4) Brazil Current
Huge amounts of goods from Asia flow to ports in Europe and North Africa through the man made
Answer:
canal. Panama Canal
Explanation:
What is the capital of itili and the UK?
Answer:
rome is the capitial
Explanation:
Answer:
The capital of italy is Rome and the capital of the U.K is there is NO capital as it is a group of countries but the countries in the U.K capital's is: England-London, Scotland- Edinburgh, Wales- Cardiff and Northern Ireland- Belfast.
What were James Buchanan’s political accomplishments? Identify and explain at least 3 accomplishments
Answer:
James Buchanan was a lawyer whose gift for oratory led him to politics. He served in the Pennsylvania legislature (1814–16), the U.S. House of Representatives (1821–31), and the U.S. Senate (1834–45). He also served in the presidential administrations of Andrew Jackson, James K.
Explanation:
Need help brainliest to best answer
Which of the following industries depends on the cultivation of sugar and has been most closely linked with increased deforestation in the Amazon Rainforest?
A. biofuel
B. chocolate
C. candy
D. soda
Answer:
D
Explanation:
What reasons did this group of people have for migrating to Pakistan? State at least 2 pull and 2 push factors for their Migration.
Answer:
Common ideology and religion.
Explanation:
The main reasons for this group of people have for migrating to Pakistan is the presence of common ideology and same religion of people. Millions of people migrated to Pakistan when the Pakistan was formed because of the worse behaviour of Hindus in India with these people due to their Muslim identity. The presence of Muslims, common ideology and worst attitude of Hindus attracts these people to migrate to Pakistan in order to live a peaceful life.
type of federalism in which both the state and the
national levels of government are equal authorities
operating within their own spheres of influence
Answer:
dual federalism.
Explanation:
I hope this helps
How do astronomers recognize regions in the night sky? *
A. by using constellations
B. by measuring apparent brightness
C. by using the Doppler shift of galaxies
D. by using naked-eye astronomy methods
what happen if china wont be there in the earth ??
Answer:
maybe it was called india!
Explanation:
Salmon farming threatens the health of wild salmon stocks primarily because
A. farmed salmon can spread parasites and disease to wild salmon
B. salmon farming prevents interbreeding between domesticated varieties of salmon and their wild counterparts
C. salmon farming prevents commercial fishing fleets from overharvesting wild salmon
D. farmed salmon compete with wild salmon for spawning sites
Answer:
A. farmed salmon can spread parasites and disease to wild salmon
Explanation:
The correct option is - A. farmed salmon can spread parasites and disease to wild salmon
Reason -
Salmon farming threatens the health of wild salmon stocks primarily because farmed salmon can spread parasites and disease to wild salmon.
definition of geostrophic force
Geostrophic wind
Answer:
A geostrophic current is an oceanic current in which the pressure gradient force is balanced by the Coriolis effect. The direction of geostrophic flow is parallel to the isobars, with the high pressure to the right of the flow in the Northern Hemisphere, and the high pressure to the left in the Southern Hemisphere.
European colonization in Southeast Asia resulted in _____.
wealth for small farmers
ethnic conflict
success for local artisans
economic independence
Answer:Wealth for small Farmers
Explanation:
Method to mine a mineral deposit which includes open pit mining quarrying placer mining and strip mining
Answer:
Surface mining
Explanation:
The method covered in the question above is called Surface mining.
Surface mining refers to the practice of extracting ores that are in the soil at medium and shallow depths, that is, they are close to the surface. This type of extraction of ores, exploits the mineral deposits until it causes its depletion, creating small depressions in the land that can be used to create landfills. The main ores found in this type of extraction are: limestone, clay, marble, coal, plaster, among others.
f(x)=3.2x
h(×)=2x-7.
h(f(2))
Answer:
h =2 x=b
Explanation:
h f =2x=b
When it is 10 PM at 15° E, what will be the time at 15° W?
Answer:
It would be 10 AM 15 degrees west
Explanation:
The reason for that is because the east and Western Hemispheres are 12 hours when you are the same degree just east instead of south.
PLEASE HELP ASAP IM TAKING A TEST PLSPLS I WILL GIVE BRAINLIEST
What special physical property of the upper mantle supports the Theory of Plate Tectonics?
Lithosphere
The lithosphere is the solid, outer part of the Earth, extending to a depth of about 100 kilometers (62 miles). The lithosphere includes both the crust and the brittle upper portion of the mantle. The lithosphere is both the coolest and the most rigid of Earth’s layers.
at type on
ectromagnetic radiation has a wavelength of 3.2 X
2. What type of electromagnetic radiation has a wavelength of 4.0 x 10-9
3. What type of electromagnetic radiation has a wavelength of 7.3 x 10-5
4. What type of electromagnetic radiation has a wavelength of 1.2 x 10-13
5. What type of electromagnetic radiation has a wavelength of 6.8 x 102
Answer:
at type on
ectromagnetic radiation has a wavelength of 3.2 X
2. What type of electromagnetic radiation has a wavelength of 4.0 x 10-9
3. What type of electromagnetic radiation has a wavelength of 7.3 x 10-5
4. What type of electromagnetic radiation has a wavelength of 1.2 x 10-13
5. What type of electromagnetic radiation has a wavelength of 6.8 x 102
What does Egypt look like in the map
Answer:
Explanation:
I do not know
Describe two effective means of preventing the spread of malaria.
Answer:
There are two central blocking systems: Protective bed nets treated with long-lasting instinct poison prevent bites from malaria-infected mosquitoes and kill them. Nets should be available for free or at low prices because of high subsidies. There should be one net per two people who are at risk of being infected.
Explanation:
Presently, Mosquito control and mosquito-bite prevention are the two key approaches used to prevent malaria.
How can you prevent the spread of malaria?Personal protection measures against mosquito bites- Malaria is primarily transmitted at night since the majority of Anopheles mosquitoes bite at night. Wearing clothing that covers the majority of the body, using insect repellent on exposed skin, and using mosquito bed nets are all ways to prevent mosquito bites. Age and status affect the kind and strength of repellents.Mosquito prevention- The effectiveness of vector control strategies is dependent on the vector species, the biology of the mosquito, the epidemiological situation, the cost, and the acceptability to the people. The primary current approaches concentrate on reducing human-mosquito interaction and eliminating larvae through environmental management.To learn more about malaria
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Besides the California gold rush, where else has hydraulic mining been used?
Answer:
the Central Otago Gold Rush that took place in the 1860s in the South Island of New Zealand
List 3 serious effects volcanoes can have on land/people...
Answer:
Fast-moving lava can kill people and falling ash can make it hard for them to breathe. They can also die from famine, fires and earthquakes which can be related to volcanoes. People can lose their possessions as volcanoes can destroy houses, roads and fields
Explanation:
What ocean separates Africa and India?
Answer:
The Atlantic Ocean meets the Indian Ocean south of Africa at Cape Agulhas. The Indian Ocean,
Explanation:
I hope this helps you :)
Why is canada unable to meet its environmental challenges by itself?
Answer:
Canada should limit fossil fuel use because it is thought to be one major cause of climate change....Canada is unable to meet environmental needs by itself because many of the chemicals that cause acid rain are being created by the US.
what is AISD-MOD WORLD GROGRAPHY B IC-
Answer:
Explanation:
He’s right
In World Geography you will examine people, places, and environments at local, regional, national, and international scales from the spatial and ecological perspectives of geography. You will learn the influence of geography on events of the past and present with emphasis on contemporary issues. A significant portion of the course centers around the physical processes that shape patterns in the physical environment; the characteristics of major landforms, climates, and ecosystems and their interrelationships; the political, economic, and social processes that shape cultural patterns of regions; types and patterns of settlement; the distribution and movement of the world population; relationships among people, places, and environments; and the concept of region. You will analyze how location affects economic activities in different economic systems. You will identify the processes that influence political divisions on the planet and analyze how different points of view affect the development of public policies. You will compare how cultures shape the characteristics of regions and analyze the impact of technology and human modifications on the physical environment. You will use problem-solving and decision-making skills to ask and answer geographic questions.
What can you do when you feel pressured to do things you’re unsure of?
Answer:
check in with yourself. ask, "how am I feeling about this?" " does this seem right to me?" " what are the pros and cons of making this decision?"
Explanation:
how many land features are their in texas
the answer is 4
the Panhandle, North Texas, South Texas, and West Texas.