d. jointing
Explanation:
The surface area of rocks exposed to weathering is increased by jointing.
Jointing in rocks increases their surface area.
- Surface area is the outer part of something.
- Mechanical weathering or physical weathering is highly renowned agent for increasing the surface area of rocks.
- When rocks fracture they creates cracks called joints.
- Joints increases the amount of surface exposed.
- Chemical weathering goes faster in surfaces with increased surface area.
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The Solution to your question is C.
The Grand Canyon of Arizona is one of world’s largest and
steepest canyons. It ranges up to 277 miles long and 18 miles wide. Its
formation is carved due to the erosive power of the water’s current. As heavy rains continue to occur, more rocks
and stones erode and fall which adds length and width to the Grand Canyon.
Answer:
This happens because viruses mutate and vary according to the environment they face. That is why different strains occur and appear every day, which must be updated in the vaccines, in order to have immunity up to date and keep up with the viral mutation without making us sick.
Explanation:
Viruses are acellular structures that do not have their own metabolism or replication method, it is because they must dominate and invade the human body so that its DNA or RNA is coupled to the human and this uses the human machinery to be able to replicate.
On the other hand, as infections occur and viruses appear, they can associate with bacteria forming bacteriophages, they can mutate within an organism that is infected by more than one viral infection and they can even adopt retrovirus mechanisms, which day by day. These new viruses are called as new strains, which evolve and will have to be coupled with vaccines.
Vaccines are a method of natural ACTIVE immunity, that is, part of the virus is inoculated, so that it generates the formation of a specific antibody in the body.
