1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Elenna [48]
3 years ago
13

if the following graph represents the decay of strontium-90 in an igneous rock, what event occurred at 0 years on the horizontal

axis ?

Biology
2 answers:
kodGreya [7K]3 years ago
7 0

Answer:

At 0 years, an event took place which is known as metamorphosis of igneous rock i.e., formation of igneous rocks from melted magma.

Strontium-90 is a radioactive element which undergoes beta decay to form yttrium-90. It has a half life of approximately 28 years and decay energy of 0.546 MeV. This radioactivity is used by geologist to estimate the age of the rock, fossils, meteorites etc. Other radioactive elements used by the geologists are carbon-40, potassium-40 etc.

Radiometric clock is set when the rock was formed in the past i.e., the moment when an ingenious rock was solidified from molten magma.

Anon25 [30]3 years ago
5 0
When the magama or lava first hardend to become rock.
You might be interested in
Which mineral helps hold calcium to the teeth making them more resistant to decay
Alex73 [517]
The enamel. For example lemon juice can destroy your enamel it’s like another way that protects the teeth but you should also protect the enamel.
3 0
3 years ago
Coral habitat is diminishing world-wide at an alarming rate. From what you know about sponges, cnidarians and Ctenophores, why i
Katyanochek1 [597]

Destruction of coral reefs would cause an imbalance in the ecosystem. Some species could be driven to extinction.  

Coral reefs are the base of the most diverse marine ecosystem in the world. They are often referred to as the ‘rainforest’ of the oceans and seas.  They provide shelter for cnidarians, sponges, crustaceans, and etcetera and provide hiding grounds from predators.

5 0
3 years ago
Phenylketonuria causes a severe cognitive disability due to the inability to metabolize phenylalanine. It is an autosomal recess
Schach [20]

Answer:

The frequency of the carriers (heterozygotes) in Massachusetts is 0.018

Explanation:

Due to technical problems, you will find the complete explanation in the attached files

Download pdf
5 0
2 years ago
In bones, a layer of osteoblasts and osteoclasts line the interior of the bone (this cellular layer covers all trabeculae, is ad
Westkost [7]

Answer:

Endosteum plays an important role in bone repair, bone remodelling and appositional bone growth.

Explanation:

Endosteum consists of a soft and thin connective tissue that lines the cavity of femur and humerus. Some of the major functions of endosteum are as follows:

Bone remodelling: Endosteum can stimulate the bone resorption that leads to the formation of new bone from the outside.

Bone repair: Hematoma, at the time of bone injury causes the division of endosteal cells and helps in bone repair.

Appositional bone growth: Endosteum that line the osteoblast cell can secrete bone matrix and increases the bone diameter.

8 0
3 years ago
Which of the following options describes a morula? THANKS FOR THE HELP!
stiv31 [10]

Answer:

A

Explanation:

4 0
3 years ago
Other questions:
  • How does acid rain affect aquatic animals?
    12·1 answer
  • Which equation turns food into energy
    12·1 answer
  • Studying the decay of radioactive isotopes in dead organisms helps scientists to identify fossilized remains. The ratio of C-12
    6·1 answer
  • In a sample of yeast DNA, 31.5% of the bases are adenine (A). Predict the approximate percentages of C, G, and T.
    13·1 answer
  • PLEASE ELP ME
    11·1 answer
  • Definitive diagnosis of multiple myeloma includes the triad of bone marrow plasmacytosis, lytic bone lesions, and:_______
    12·1 answer
  • Explain what happens to the mass during photosynthesis and cellular respiration
    6·1 answer
  • At which latitude were these apparent Sun paths most likely observed?
    10·1 answer
  • A student builds a model of a DNA strand.
    11·1 answer
  • Where are proteins produced other than on ribosomes free in the cytosol or ribosomes attached to the endoplasmic reticulum?.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!