Answer : scientists determine the absolute age of a rock in millions of years before present rather than just the age of the rock relative to the rock units around it. This information helps geologists develop more precise geological history models for the rocks and regions they study.
Explanation:
Brazil's coastline is 7,491 km and Argentina's coastline is 4,989 km. If you subtract, it will be 2,502
Answer:
The correct option is B. all the same approximate size
Explanation:
The sorting of sediments is the distribution of the particles or the grains of the sediments on the basis of the grain size. The sediments are classified into the following categories on the basis of their grain size : very poorly, poorly, moderately , well and finally, very well sorted.
The sorting is quantified by using the Inclusive Graphic Standard Deviation represent by 
For a well-sorted layer of sediment, the Inclusive Graphic Standard Deviation is:
, diameter (phi units)
Therefore, in a well-sorted layer of sediment, all the grains will be of the same approximate size.
Answer:
volcanoes most common in subduction zones between oceanic and continental plates
Explanation:
- Plate boundaries are share and thin sheets of slabs over the surface of the earth and these boundaries are demarcated by the ridges and trenches and interplate margins as the plate tends to move in the opposite direction to the forces of friction and the pushing and pulling nature of the rock from the mantle below crates a dynamic force that created most volcanoes.
- The impact of these zones like the fault line and the lines that divide the plate margins tends to fall into a deep zone full of trenches and cavities that leads to the burning of the plate matter and the rising current then pushes this upwards and hence result is volcanic eruption due to the heat and pressure build inside.
