Answer:
- <u><em>The rock components of the crust are slowly but constantly being changed from one form to another and the processes involved are summarized in the rock cycle (Figure 3.2). The rock cycle is driven by two forces: (1) Earth’s internal heat engine, which moves material around in the core and the mantle and leads to slow but significant changes within the crust, and (2) the hydrological cycle, which is the movement of water, ice, and air at the surface, and is powered by the sun.
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- <u><em>The rock cycle is still active on Earth because our core is hot enough to keep the mantle moving, our atmosphere is relatively thick, and we have liquid water. On some other planets or their satellites, such as the Moon, the rock cycle is virtually dead because the core is no longer hot enough to drive mantle convection and there is no atmosphere or liquid water.</em></u>
Explanation:
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Answer:
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Explanation:
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Answer:
The thyroid stimulating immunoglobulin in Graves disease is an antibody to the membrane receptors of thyroid cells that bind TSH.
Explanation:
Graves disease is an auto-immune disease in which antibodies produced by one's own body attacks the thyroid gland.
When pituitary gland is stimulated by TRH i.e. thyrotropin releasing hormone from hypothalamus, it releases TSH i.e thyroid stimulating hormone. TSH then goes and binds to the receptors on thyroid cells and stimulate the release of T3 and T4 thyroid hormones. In case of graves disease the antibody binds at the same site as TSH thereby continuously giving signal for the release of T3 and T4 thyroid hormones. This results in hyperthyroidism.