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usually and underwater volcano.
no ---------- Elements are atoms, which can be separated into smaller particles such as protons, neutrons, electrons, and quarks, but usually not by chemical processes.
Copper is present in almost all continental crust, but in very small amounts. It is concentrated, usually, by hydrothermal processes.
It adds Acids to the blood, and they are Strong.
reactions that are controlled by catalysts
No. Evaporation is energy-intensive, which usually means expensive. Some solar distillation processes are cheaper, but inefficient and slow.
No. Evaporation is energy-intensive, which usually means expensive. Some solar distillation processes are cheaper, but inefficient and slow.
A vocational school is usually the most flexible regarding course schedules.
Usually as a percentage. 80% efficient, for example.
technology
Inflexible is the most commonly prefixed form. The verb is " flex ", not the adjective flexible. Thus, the bodybuilders flexed their muscles for the girls. The verb takes a direct object, and needs no preposition.
The disadvantages of selection processes is that it is usually expensive and is never that open and transparent in corrupt institutions.
nope. usually comes as a powder or cast into a shape
usually and underwater volcano.
Single covalent bonds are usually flexible, but when the bonds form an extended three-dimensional structure they can become very inflexible, as in diamond.
Yes, all vertebrates have a backbone. Birds are unusual because they have very flexible necks (usually), which is important for preening (they don't have hands or paws, and feathers require upkeep), but for energy-efficient flight they need perfectly rigid backs, so their mid/lower spine is rigid, and the upper spine highly flexible. You can explore this yourself during Thanksgiving. :-)
An incandescent bulb is 96% efficient as a heater, and 4% efficient as a source of light. A fluorescent bulb is only 60% efficient as a heater, and 40% efficient as a source of light. An LED bulb is only 10-20% efficient as a heater, and 80-90% efficient as a source of light (but that light is usually unidirectionally directed... harder to do diffuse lighting with them).