Question

unit 2 exit ticket 1.4

1. how are sedimentary rocks formed?
2. how are igneous rocks formed?
3. provide two characteristics of of sedimentary rocks.

a.
b.

1. provide two characteristics of igneous rocks.

a.
b.
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Explanation:

1. Sedimentary rocks form from the accumulation and compaction of sediments. These sediments can be fragments of other rocks, minerals, or organic matter that are transported by water, wind, or ice and then settle out of the transporting medium and build - up in layers. Over time, the weight of the overlying layers compresses the lower layers, and minerals may cement the sediments together.
2. Igneous rocks form from the cooling and solidification of magma (beneath the Earth's surface) or lava (on the Earth's surface). Magma is molten rock material that contains a mixture of minerals, gases, and sometimes suspended crystals. When it cools, the minerals within it crystallize and form an igneous rock.
3. Characteristics of sedimentary rocks: A. They often have layers (strata) due to the sequential deposition of sediments. B. May contain fossils as they can preserve the remains or traces of ancient organisms that were part of the sediment.
4. Characteristics of igneous rocks: A. Can have a crystalline texture. The size of the crystals depends on the rate of cooling (slow - cooling leads to larger crystals). B. May have vesicles (holes) if gas bubbles were trapped during the solidification of lava.

Answer:

1. Sedimentary rocks are formed from the accumulation, compaction, and cementation of sediments.
2. Igneous rocks are formed from the cooling and solidification of magma or lava.
3. A. Have layers (strata). B. May contain fossils.
4. A. Have a crystalline texture. B. May have vesicles.