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A conglomerate is a rock that forms as a result of compaction and cementation. The correct answer between all the choices given is the first choice or letter A. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

A conglomerate is a rock that forms as a result of compaction and cementation.

Conglomerate rock is a type of sedimentary rock which are formed as a result of compaction and cementation.

Further Explanation

Rock

  • A rock is a naturally occurring substances that is a solid mixture of one or more minerals together with organic matter.
  • Rocks are classified based on the chemical composition, texture and the way they are formed.  

Rock cycle

  • One type of rock may change from one form to another through a rock cycle.
  • Rock cycle is the process through each various rocks change from one form to another, normally an interchange between the three major types of rocks.

Major classification of rocks:

Sedimentary rocks

  • Sedimentary rocks are types of rocks that are formed through accumulation of sediments at low temperatures in tectonic layers and sinks. The process involved include compaction and cementation of sediments.
  • These sediments includes; pebbles, shells, sand and other material fragments.  
  • The sediments accumulates in layers and then harden into rocks over a period of time.
  • Examples of sedimentary rocks include; limestone and conglomerate

Metamorphic rocks

  • These are types of rocks that are formed as a result of changes that occurs due to intense heat and pressure under the surface of the earth. They result from action of heat and pressure on other rocks that pre-existed.
  • These types of rocks are characterized by shiny crystals, ribbon-like layers among other features.
  • Examples of metamorphic rocks are marble and gneiss

Igneous rocks

  • These are types of rocks that are formed as a result hardening and cooling of magma from volcanic eruptions. Magma may cool inside the earth or when on the surface of the earth as a result of volcanic eruptions. The lava from this eruptions cools and hardens to form metamorphic rocks.
  • Igneous rocks are glass-like and shiny with no crystals. They may also have tiny spaces and holes due to gas bubbles trapped during the cooling process.
  • Examples of igneous rocks include obsidian and basalt.

Key words: Rocks, chemical composition, sedimentary rocks, conglomerate.

Learn more about;

  • Rocks and rock types; https://brainly.com/question/2817889
  • Sedimentary rocks; https://brainly.com/question/2817889
  • Igneous rocks; https://brainly.com/question/2817889
  • Metamorphic rocks; https://brainly.com/question/2817889

Level; High school

Subject: Geography

Topic:  Rocks

sub-topic: classification of rocks