Final answer:
The question about igneous rocks refers to the process of identifying these rocks based on characteristics such as texture and mineral composition, typically involving feldspar and quartz among others. I
Step-by-step explanation:
The question about igneous rocks seems incomplete as it mentions 'contain 44' without further context. However, using the reference provided, we can discuss igneous rocks in general. Igneous rocks are formed through the cooling and solidification of magma or lava. Identification of these rocks often involves examining their texture and composition, which includes identifying minerals like feldspar and quartz, as well as accessory minerals such as hornblende and biotite.
In the context of a rift valley, the types of igneous rocks you would expect to find typically include basalt and andesite, which are usually fine-grained due to their extrusive origins. Coarser-grained igneous rocks, such as granite, are also present in some rift valleys but form deeper within the Earth's crust as intrusive igneous rocks.
For identifying unknown igneous rock samples, it is important to note their color, texture, and mineral composition. These characteristics can be observed by examining rock samples directly or by viewing them through photographs with a magnified view if available.
To effectively capture the characteristics of an igneous rock required for an assignment, focus on the spelling and grammar while describing the rock using complete sentences, and if possible, include a photograph of the rock sample.