Can someone please help me with my review?

1)What grade of metamorphism common rocks are formed in-
--- Is it high grade?

2)What is the name of the most rapid kind of mass wasting is>
-- Weathering?

3)How to tell is a rock is igneous, metamorphic or sedimentary.

4)How to tell the grain size of a rock

5)How to tell if a rock is foliated

6) Which of the following rocks are igneous?
Obsidian, granite, diorite, shale, schist, coquina, rhyolite, slate, gneiss

Sure! I'd be happy to help you with your review. Let's go through each question one by one and explain how to find the answers.

1) What grade of metamorphism common rocks are formed in?
To determine the grade of metamorphism common rocks are formed in, you can refer to a metamorphic rock classification chart or consult a geology textbook. These resources typically categorize metamorphic rocks into different grades based on the intensity of their metamorphic processes. High-grade metamorphism refers to rocks that have undergone significant heat and pressure, resulting in extensive mineral recrystallization and structural changes.

2) What is the name of the most rapid kind of mass wasting?
To identify the most rapid kind of mass wasting, you need to understand the different types of mass wasting. Mass wasting refers to the downslope movement of Earth's materials due to gravity. The most rapid type of mass wasting is typically referred to as a "landslide." Landslides occur when a large amount of material rapidly moves downhill, often triggered by factors like heavy rainfall, earthquakes, or human activity.

3) How to tell if a rock is igneous, metamorphic, or sedimentary?
To determine whether a rock is igneous, metamorphic, or sedimentary, you can use several methods:

- Igneous rocks are typically formed from the cooling and solidification of molten material (magma or lava). They often have a crystalline or glassy appearance and may contain visible mineral crystals or vesicles.
- Metamorphic rocks are formed from the transformation of preexisting rocks due to heat and pressure. They often exhibit foliation (layering) or recrystallization of minerals, giving them a distinct texture.
- Sedimentary rocks are formed from the deposition and lithification of sediments. They often display distinct layers or bedding, along with various sedimentary structures like fossils or ripple marks.

These characteristics can help you identify the rock's origin and classify it accordingly.

4) How to determine the grain size of a rock?
To determine the grain size of a rock, you can use a hand lens or a microscope with thin sections (slices of the rock) to examine its texture. Grain size refers to the size of individual mineral grains in the rock.

- Coarse-grained rocks have large, visible grains that can be easily identified with the naked eye.
- Fine-grained rocks have small grains that may require a hand lens or microscope to observe.

By examining the rock's texture and identifying the average size of individual mineral grains, you can determine its grain size.

5) How to tell if a rock is foliated?
Foliation refers to the repetitive, parallel layering or banding present in some metamorphic rocks. To identify if a rock is foliated, you can visually inspect it for the presence of distinct layering or banding. Foliation often occurs in metamorphic rocks that have undergone significant pressure and shearing. Common foliated rocks include schist and gneiss, which display visible foliation patterns.

6) Which of the following rocks are igneous?
To determine which rocks among the given options are igneous, you need to know their origin. Igneous rocks are formed through the cooling and solidification of magma or lava. The igneous rocks from the provided list are:

- Obsidian: This is an igneous volcanic glass formed from quickly cooled lava.
- Granite: This is a coarse-grained intrusive igneous rock.
- Diorite: This is also a coarse-grained intrusive igneous rock.
- Rhyolite: This is an extrusive igneous rock formed from lava.

The other rocks mentioned in the list (shale, schist, coquina, and slate) are not igneous but rather sedimentary or metamorphic in origin.

I hope these explanations help you with your review! If you have any more questions, feel free to ask.