The Crowsnest Pass in southern Alberta hasn't seen a working coal mine in decades but an Australian company has a plan to change that.Sydney-based Riversdale Resources has spent almost $50 million acquiring coal properties in Crowsnest Pass, including the Grassy Mountain property north of Blairmoreâ.teve Mallyon, managing director of Australian-based Riversdale Resources, says his company's planned open pit coal mine in the Crowsnest Pass could produce two to four million tonnes of coal a year over 28 years. (Allison Dempster/CBC).
When it is closed and you stand in front of it the image on your retina is approximately rectangular. But when you open the door it will become trapezoidal on your retina. You can get an idea of how rectangular shapes are projected on your retina by looking at the shape constancy demo. This phenomenon of your perceiving the real shapes of objects regardless of their retinal projections is called shape constancy. It is one of the several perceptual constancy that one encounters.
Gender constancy is a child's realization that gender is fixed and does not change over time.