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WK1 Discussion Questions

Please help with the following questions;

1. What are the three rock types, and how are they formed? Where are they generally located? What are the attributes of their composition?

2. How do fossils tell us about the climate in a particular location millions of years ago?

3. How are fossils used in this discovery to provide information to scientists today about life 3.3 million years ago?

Solution Preview

1. What are the three rock types, and how are they formed? Where are they generally located? What are the attributes of their composition?

The three major rocks types are igneous, sedimentary, and metamorphic rocks. Igneous rocks can be formed underground or above ground. Underground, they are formed when magma, deep with the earth becomes trapped into localized pockets. These spots of magma slowly cool underground, becoming igneous rocks. Above ground, igneous rock are formed during volcanic activity. When volcanoes erupt, they emit magma in the form of lava. This lava cools above ground, becoming another type of igneous rock. Therefore, igneous rocks are typically located deep underground, near subduction zones, near volcanoes. They are typically classified as being mafic (very dark in colour and with a low amount of silica) or felsic (light in colour with high amounts of silica).

Sedimentary rocks contain three main groups: clastic, chemical and organic. Sedimentary rocks are usually created in water bodies, at the bottom of rivers, lakes, and oceans. They are known to be a composition of many different particles of eroded earth, developed into one single rock through increased pressure. As layers of eroded earth get deposited on top of one another in water bodies, the layers underneath receive an increasing amount of pressure. This occurs until the bottom layer slowly turns into a rock formation. Sedimentary rocks are typically ...

Solution Summary

The solution examines three risk types and how they are form. The general attributed of their composition are determined. The climate in a particular location millions of years ago are determined.

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