They are made by melting glaciers
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Slitstone
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I wanna say D.
Sorry if I’m wrong:(
Answer: Harmful algal blooms can produce toxins (poisons) that can make people and animals sick and affect the environment. During warm weather, tiny plant-like organisms—algae and cyanobacteria—are more likely to grow out of control in rivers, lakes, and oceans.
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~Emilie G.
Continental crust is defined as having higher concentrations of very light elements like K, Na, and Ca, and is the lowest density rocky layer of Earth. Its average composition is similar to granite.
The crust, with an average density of around 2.6 grams per cubic centimeter (g/cm3), is less dense than the mantle (average density of approximately 3.4 g/cm3 near the surface, but more than that at depth), and so it is floating on the “plastic” mantle. Earth's interior layers are ordered by density. The densest layer is the solid metal inner core, the mantle is of intermediate density, and the least dense layer is the lithosphere, particularly the continental lithosphere Earth's Crust. “Crust” describes the outermost shell of a terrestrial planet. Earth's crust is generally divided into older, thicker continental crust and younger, denser oceanic crust
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