12. How does the nature of the overlying plate affect the nature of the landform
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Question
12. How does the nature of the overlying plate affect the nature of the landform?
13. What are some of the ways sediment gets from the land mass to the deepest seafloor?
Play doh geology: Top View Fault A Play doh: cross section (Side View The following questions are about the play doh model displayed in top view and cross section. This geologic units of this play doh model consist of: a fault labelled "A" that cuts through everything sedimentary layers,"B" (Conglomerate):"D" (sandstone); "E" (shale); "F" ( another sandstone) A basalt labelled "C" Describe some of the qualities one might look for in an index fossil such as might be found in the layers of this geologic model above. Would you want something that had been around a long time or for a limited interval? Would you want something localized or widespread? Why /why not?Explanation / Answer
11) index fossiles are also called indicative fossils which used to identify different geologic periods. there are fossils which are limited to a particular age of era.a good index fossil will have these qualities,(a) its distinctive (b) abundant (c) limited to geologic time (d) wide spread.
sand stone is formed by the cementation of sand grains, so it is a coarse grained, and it is found in the environments such as beaches, oceans, rivers deltas and flood plains and contains fossils of trilobytes, brachiopods, crustaceans, bryozoans and plants. shale is a fine grained sedimentary rock composed of mud and clay, and found to form in the marine environment and so it has the fossil contents of brachiopods, plants, algae,and arthropods. the fossils contents indicate a limited time from the fossil contents of the layers, ther can be differnt stratas found in many other locations if they have a common fossil content we can conclude that they formed in the same geologic time and also it should be wide spread so that we can make use of this fossile to compare sedimentary stratas and found out same aged layes in different geographical regions.
12) Earth's surface has a wide variety of land forms formed as a result of different geologic actions taken place, tectonic plate movement is the key factor that controle the formation of land forms. tectonic collision zones uplift the plate and form mountains hilly land forms with th sedimentary layers on the top. rain fall and winds erode this and form vallys and canyons by the flow of streams from the hills and mountains which carry the sediments. land froms can form under the water as mountains, basins; the deepest land form is the Mariana trench formed by the subduction of plates. highest land form on earth's surface is the everst formed by the collision of indian and Euracian plates.
13) seafloor is suffient with the sediments, especially formed from the land mass by erosion of rivers, such sediments are called terrigenous sediments. erosion by the rivers carry sediments all the time and reaches at its peak during flood, these water reaches the ocean and start deposit, heavy minerals deposit immediately and fine less dense deposit slowly on the continental shelf, as the deposition increases along the slopes, by the action of gravity it slide down along the continental slope and form a continental rise on the plain, then by the action of ocean currents the fine sediment deposits carried to the deep ocean floor.
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