Question

unit 2 exit ticket 1.3
students created two different models while learning about how rocks form.
model a - the student took small pieces of broken cereal and candy and pressed it down in layers until it glued and hardened together.
model b - the student poured melted crayons into a cup and it cooled down and became a solid.

1. which model represent the formation of igneous rock? why?
2. which model represents the formation of sedimentary rock? why?
3. fill in the blanks with cementation and compaction:

when the student was making the sedimentary model and pressing the cereal together they were modeling _, and when the bits of cereal and candy hardened and glued together that represented _.

1. why are igneous rocks and sedimentary rock considered different kinds of rock?

Explanation:

1. Igneous rocks form from the cooling and solidification of molten material (magma or lava). Model B involves pouring melted crayons (simulating molten material) and then cooling to form a solid, similar to how igneous rocks form.
2. Sedimentary rocks are formed by the accumulation and compaction - cementation of sediments. Model A with small pieces of broken cereal and candy pressed down in layers and then hardened represents the process of sediment accumulation and cementation.
3. Compaction is the process of pressing sediments together, which is what happened when the cereal was pressed. Cementation is when sediments are glued together by minerals, which is represented by the hardening and gluing of cereal and candy.
4. Igneous rocks form from molten material cooling, while sedimentary rocks form from the accumulation and cementation - compaction of sediments, so they have different formation processes.

Answer:

1. Model B represents the formation of igneous rock because it simulates the cooling of molten material like lava.
2. Model A represents the formation of sedimentary rock because it simulates the accumulation and cementation of sediments.
3. Compaction; Cementation
4. They have different formation processes. Igneous rocks form from cooling of molten material, while sedimentary rocks form from accumulation and cementation - compaction of sediments.