Tutor profile: Emily V.
Subject: Environmental Science
Name one of the biochemical cycles of Earth and describe the cycle using several examples.
One biochemical cycle of Earth system is the carbon cycle. Carbon is absorbed from the atmosphere by plants through the process of photosynthesis. Plants take carbon dioxide from the air, and convert it into glucose as stored energy for other living organisms. When other living organisms consume this plant material, they take the energy from the breaking down of food and then release the carbon back into the earth. When an organism dies, its matter, including the carbon in its body, is cycled back into the earth through decay. As living organisms decay, the carbon that was once stored in their bodies is now released back into the atmosphere, and it is cycled all over again.
Subject: Earth Science
Explain sea-floor spreading. Which type of tectonic plate boundary is found at areas of sea-floor spreading?
Sea-floor spreading occurs at divergent plate boundaries, in which tectonic plates separate and allow new crust to form. Convection currents in the Earth force magma up through cracks between the plate boundaries. Then, this magma cools and forms into new crust on the surface of Earth, usually at the bottom of the ocean where there is a trench. The plates are constantly shifting and moving, like a conveyor belt, to produce new crust. This is was gives the name of "sea-floor spreading".
Subject: Physical Science
According to the Periodic Table of Elements, Beryllium has an atomic number of 4. What does this tell you about the element Beryllium?
Because Beryllium has an atomic number of 4, it must have four protons, according to the Periodic Table of Elements. Additionally, a neutrally-charged Beryllium atom would also have four electrons. You cannot tell how many neutrons a Beryllium atom has from the atomic number, because the atomic mass is needed to determine how many neutrons Beryllium has.
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