Core samples provide us with actual samples rocks from inside Earth. They are considered direct evidence of the Earth-s interior. Seismic waves are a form of energy that travels through or across Earth and helps scientists infer what is inside Earth. They are indirect evidence.
Explanation:
Core samples are direct evidence of what is inside the Earth because they take a direct sample of the rocks that make up the layers of the Earth-s surface and core. Geological core samples can indicate to researchers variations in weather patterns and climate changes through time. There can also be evidence of species and and the sedimentary composition of lake beds and rivers for example. Core samples provide direct evidence of the dynamic nature of the Earth's formation and how it changes through time. Seismic waves help to tell where there are variations in the Earth's composition. Geologists can study seismograms to discern about the different content of the Earth's internal structure like which parts are solid, molten or composed of gases.
Sedimentary rocks that are formed due to the accumulation of sediments that are derived from the deposition of small particles and their cementation of minerals and organic particles in the seafloor by the impact of various geological and earth processes like the wind, water, and glacier erosion.
Earth's crust is covered by 73% of sedimentary rocks and about 8% of the total crustal surface. Based on their formation, these rocks are thus classified as Siliciclastic, Carbonate, Evaporite, Iron-rich, and Phosphatic sedimentary rocks.
The color of these rocks is always determined by the iron and oxide contents, their size texture is a result of the density and permeability of the rocks like in the case of sandstone and limestone.
The relationship between the plate tectonics and the earthquakes is explained through the seismic waves that travel; through the three-layer of the earth from core to mantle to crust.
Earthquakes are directly related to plate boundaries as these are areas where these waves come out in the form of shocks and shaking of lands thus we expect of seeing three types of boundaries as Convergent, Divergent and Transform.
