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NNADVOKAT [17]
3 years ago
7

The oldest rocks found on Earth are 3.96 billion years old. However, scientists believe the Earth is about 4.6 billion years old

. What evidence supports this idea? Choose all that apply.
Biology
2 answers:
MAVERICK [17]3 years ago
5 0
As the earth has active tectonics we know that rocks are recycled and the oldest rocks may therefore just be the oldest rocks that have not been recycled yet. We know the true age of the earth by looking at radioactive isotopes of things like spacedust and meteors that formed at the same time as the earth as they have not been affected by the tectonic process of recycling here on Earth.
Anna35 [415]3 years ago
4 0

The Earth is 4,54 billion years old. This age has been determined with the radioactive dating technique. The precise decay rate of radioactive elements is used as a clock: the number of daughter products in one rock indicates its age.

The oldest meteorites ever dated in the Solar System are 4,56 billion years old, the oldest minerals on Earth are 4,4 billion years old, and the oldest rocks on Earth are 4 billion years old. These ages are very consistent because the meteorites had to form before the accretion of our planet, and the Earth had to cool down before the first minerals could crystallise.

The Solar System was formed around 4.6 billion years ago, out of the collapse of a dense cloud composed of dusts and gases. Meteorites, which are the very components of our planets (through the process of accretion), are the remnants of the Solar System’s origins. Dating meteorites thus allows us to give a lower age to the Solar System (4,56 billion years old).

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4 0
3 years ago
Place the objects in order from least greatest mass to greatest mass terrestrial gas giant Ice dwarf Ice giant
CaHeK987 [17]
<h2>Answer:</h2>

Correct order from least greatest mass to greatest mass:

  • Terrestrial
  • ice giants
  • Ice dwarfs
  • Gas giants
<h3>Explanation:</h3>

The above given list contains the names of different planets depending upon their compositional characteristics. According to this list gas giants are heavier and then ice dwarfs and then ice giants.

Terrestrial which means planet earth is top on the list, which is lighter in weight than other planets.

7 0
3 years ago
Chlorophyll is an accessory pigment in plants.<br><br><br> True<br><br> False
Phantasy [73]

Answer:

True

Explanation:

it is a pigment used in the process of photosynthesis and also gives the plant it's green colour.

4 0
3 years ago
Read 2 more answers
The color blindness gene is recessive and X linked. It is written as Xb. A woman who is color blind has a son with a man with no
Taya2010 [7]

Answer:

XbY

Explanation:

The gene responsible for colorblindness is written as Xb since it is present on the X chromosome. In humans, sons get their X chromosomes from the mother while inheriting the Y chromosome from the father. In the given cross, the genotype of the colorblind mother would be XbXb (the X-linked recessive traits such as colorblindness are expressed in homozygous conditions in females).

She would transmit one copy of "Xb" to her son. The genotype of the father would be "XY" and he will give "Y chromosome" to the son. Therefore, the genotype of the son would be "XbY".

3 0
3 years ago
How are nucleotides linked together to form a polynucleotide chain? View Available Hint(s) How are nucleotides linked together t
Maslowich

The correct answer is: In DNA and RNA, a phosphodiester linkage connects the 3' carbon of one nucleotide and the 5' carbon of another.  

The phosphate of one nucleotide is covalently bound to the sugar of the next nucleotide in DNA molecule (or hydroxyl groups in phosphoric acid react with hydroxyl groups on 3' carbon atom of one sugar molecule (deoxyribose) and the 5' carbon atom of another sugar molecule (deoxyribose) to form two ester bonds). In RNA molecule linkage is between the 3' carbon atom of one sugar molecule (ribose) and the 5' carbon atom of another, (ribose).  

Hydrolysis of phosphodiester bonds is catalyzed by the action of enzymes phosphodiesterases.

8 0
3 years ago
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