Answer:
As the two plates move apart from each other, which often occurs at a rate of several centimetres per year, molten rock wells up from the underlying mantle into the gap between the diverging plates and solidifies into new oceanic crust. Spreading centres are found at the crests of oceanic ridges.
Explanation:
I found this answer by taking notes in class
The volume of the substance is 61.4 litres.
Explanation:
Specific density is the ratio of density of a substance at a given temperature with the density of reference substance.
Data given:
mass = 750 grams
specific gravity = 12.2
volume=?
The formula to be used:
Specific gravity = 
suppose the other substance is water so its density is 1g/ml at 4 degrees
Putting the values to the equation:
density of the object = 1 x12.2
density of the substance = 12.2
Now using the formula:
density = 
putting the values in the equation:
volume = 
= 61.4ml is the volume of the substance.
Answer:
<em>True</em>
Explanation:
Arsenic is an element that has similar behavior to metal, it is toxic to humans. It can be produced by some human activities but it is also available in nature in its organic or inorganic form, this last one being more toxic.
Organic arsenic can be found especially in sea-living organisms.
Inorganic arsenic can be found in the earth's crust and it can affect the acidity levels (PH) of the soil.
The properties of malleability and ductility can all be explained on the basis of metallic bonding.
<h3>What is malleability?</h3>
The term malleability refers to the ability of a metal to be hammered into sheets. It is a very important property of metals that helps in metal work. The images are not shown here hence the question is incomplete.
Ductility refers to the ability of metals to be drawn into sheets. This is the reason why metals can be used to make wires. All these properties are explained on the basis of metallic bonding.
Learn more about metallic bonding: brainly.com/question/10714037
The answer is A) <span>Electronic devices have become smaller.
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