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

Certainly, I'd be happy to help you with your review! Let's go through each question one by one:

1) To determine the grade of metamorphism common rocks are formed in, you would need to understand the concept of metamorphic grade. Metamorphic grade refers to the intensity of metamorphism a rock has undergone. The grade is determined by the temperature and pressure conditions experienced by the rock during metamorphism. High-grade metamorphism refers to rocks that have undergone significant temperature and pressure changes, resulting in the development of distinct mineral assemblages and new textures within the rock. Therefore, if you are asked if common rocks are formed in high-grade metamorphism, the answer would generally be no. Common rocks are usually formed in lower-grade conditions.

2) The name of the most rapid kind of mass wasting is not weathering. Weathering refers to the process of breaking down rocks and minerals into smaller fragments or dissolved substances due to exposure to weather conditions, such as rain, wind, and temperature changes. Mass wasting, on the other hand, refers to the downslope movement of Earth materials, such as rocks, soil, and debris, under the influence of gravity. The most rapid type of mass wasting is called a "rockslide." Rockslides occur when a mass of rock abruptly breaks away from a slope and rapidly moves down.

3) To determine if a rock is igneous, metamorphic, or sedimentary, you can utilize certain characteristics associated with each rock type. Here are some key features to look for:

- Igneous rocks: They are formed from the solidification of molten magma or lava. Igneous rocks often have interlocking crystals or a glassy texture. Examples of igneous rocks include basalt, granite, and rhyolite.

- Metamorphic rocks: They are formed from the transformation of existing rocks through heat and pressure. Metamorphic rocks can have distinct foliation (layering) or non-foliated textures. Examples of metamorphic rocks include marble, slate, and gneiss.

- Sedimentary rocks: They are formed from the accumulation and cementation of sediments. Sedimentary rocks often have visible layers or bedding structures. Examples of sedimentary rocks include sandstone, limestone, and shale.

To determine the rock type, consider the texture, composition, and any specific features or structures present in the rock.

4) The grain size of a rock can be determined by observing the size of individual mineral grains or particles that make up the rock. The following terms are commonly used to describe grain sizes:

- Coarse-grained: Rocks with large mineral grains that are easily distinguishable without using a hand lens. Examples include granite and gabbro.

- Fine-grained: Rocks with small mineral grains that require a hand lens or microscope to observe individual grains. Examples include basalt and shale.

- Medium-grained: Rocks with mineral grains that are intermediate in size between coarse-grained and fine-grained. Examples include andesite and greywacke.

Careful observation of the rock's surface or using a hand lens or microscope can help determine the grain size of a rock.

5) Foliation refers to a repetitive layering or parallel alignment of mineral grains within a rock. It is a characteristic feature of certain metamorphic rocks. To determine if a rock is foliated, look for the presence of distinct layers, banding, or parallel alignment of minerals. Commonly foliated metamorphic rocks include schist and gneiss.

6) Among the listed rocks, the igneous ones are obsidian, granite, diorite, and rhyolite. Igneous rocks are formed from the solidification of molten magma or lava. Obsidian is an extrusive igneous rock that forms when lava rapidly cools, resulting in a smooth, glassy texture. Granite, diorite, and rhyolite are intrusive igneous rocks that form when magma cools slowly beneath the Earth's surface, allowing larger mineral grains to develop.

On the other hand, shale, schist, and coquina are sedimentary rocks, while slate and gneiss are metamorphic rocks.

I hope this helps you with your review! Let me know if you have any more questions.