The decay of uranium isotopes is used to provide information about the age of Earth.
<h3>
Explanation:</h3>
Isotopes of Uranium U-232, U-233 , U-234 , U-235 , U-236 , U-238 are used as fuel in nuclear reactors or as explosives for nuclear weapons. Uranium 238 is not very radioactive and it constitutes for nearly 99.3% of natural uranium on Earth and has the longest lifetime: its period is 4.5 billion years, about the age of Earth.
Use of radiometric dating techniques help in defining the age of substances (natural or man-made) using the known decay rates of radioactive elements. Each element has an individual decay rate and half life time.
Two Uranium isotopes (U-238 and U-235) are used for radiometric dating. Both the isotopes have different decay rates and half life period. Both are unstable and radioactive. Since two different isotopes produce two different decay clocks (one as a reference to other), it is beneficial in accurately determining the age of samples. The age of earth (rocks or other natural elements) can be easily determined using Uranium isotopes.
The correct answer is b.
The child is reaching for a toy which is not visible to him (hidden under a cloth), therefore, the child has a mental representation of the object in his/her mind. This action means that the child acknowledges that the objects continue to exist even when he/she can not hear or see them. This thought process is called object permanence and it is an ability acquired between the 4th and 7th month of a child's development.
↪ Adding exercise and meditation in your life to reduce heart problem.
↪Avoiding grilled red meat ,smoked foods , microwaved foods,etc.
↪ Searching the reason to live the life maybe it could be related with your passion and aim in your life.
↪ Try creating happy and lovely atmosphere around where you can laugh,enjoy and live the life with full intensity.
↪ Avoid anything that is carcinogenic or cancer causing. You can search it on your own.
↪Seek medical advice from doctors regarding this topic
Answer:
bio diversity is important for our planet
The appropriate answer is a. Increased rainfall across the eastern Pacific Ocean. Scientists are still not sure what causes El Nino events but it does disrupt weather patterns all across the globe. One of the effects include increased rainfall along the eastern Pacific in countries such as Peru and Chile. These regions do not normally receive heavy rainfall.
