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The bimetallic strip made of iron and brass would bend most when heated. This is because brass has a higher coefficient of thermal expansion compared to aluminium, resulting in a greater bending effect when heated.
When a bi-metal strip is heated, the two metals it is made of expand at different rates due to their different coefficients of thermal expansion. This causes the bi-metal strip to bend or deform, curving towards the side of the metal with the higher coefficient of thermal expansion. This property is utilized in devices such as thermostats to control temperature.
It depends how far you bend it.
When a plate is pushed under an adjacent plate, the process is called subduction. The subducted crust melts into the core and is recycled. When the plate goes into the mantel it is heated to very high temperatures and turns into metamorphic rock.
That depends on what you mean by "not bend". Nothing will bend if it just sits there, but if you attempt to bend it with even your hands, pure gold should bend at least some noticeable distance.