Tutor profile: Fredy N.
Subject: Natural Sciences
What causes the volcanic eruptions of Mt. St. Helen to be more explosive than those of Hawaii?
The magma composition of Mt. St. Helen is different than Hawaii's magma. Mt. St. Helen has felsic magma. This means that it is higher in silica and oxygen and lower in iron and magnesium. Felsic magma has a higher viscosity, or a higher resistance to flow. Due to this higher viscosity, it takes more pressure to cause a volcanic eruption. Hawaiian magma is mafic. This is the opposite of felsic and also has lower viscosity. Mafic magma flows more easily.
Subject: Earth Science
How can you determine whether a mineral is calcite or quartz?
Calcite has a hardness of 3, which means it will not scratch glass. Quartz has a hardness of 7, which means it will scratch glass. Also, calcite bubbles when it comes in contact with acid, quartz does not.
When studying mitosis, what is the easiest way to remember the order of the different phases?
The easiest way to remember the phases of mitosis is "PMAT". P- Prophase M- Metaphase A- Anaphase T- Telophase
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