Answer:
they intersect they coincide
Explanation:
coincide one line overlaps another one
they intersect the lines meet but they are not parallel or perpendicular
Echo sounding is the key method scientists use to map the seafloor today. The technique, first used by German scientists in the early 20th century, uses sound waves bounced off the ocean bottom. ... The time taken for the sound to travel through the ocean and back is then used to calculate water depths.
The correct answer is option D
The mixture of mineral rich water reaches the sea water, the minerals rushing out gives the water the appearance of the black smoke.
The mineral rich water causes precipitation of the tiny particles of the iron rich sulfide minerals and manganese rich minerals.
This gives the black color to the smoke and it appears to be black.
The levels of structure which are broken when a protein is denatured are the secondary, tertiary, and quaternary structure.
Secondary structure: This level of structure describes the local folding pattern of the polypeptide backbone and is stabilized by hydrogen bonds between N-H and C=O groups.
Tetiary structure describes how regions of secondary structure fold together – that is, the 3D arrangement of a polypeptide chain, including a helices, b sheets, and any other loops and folds. Tertiary structure results from interactions between side chains, or between side chains and the polypeptide backbone, which are often distant in sequence.
Quaternary structure: Some proteins are composed of more than one polypeptide chain. In such proteins, quaternary structure refers to the number and arrangement of the individual polypeptide chains.