How much heat must be added to a 250g aluminum pan to raise its temperature from 20°C to 85°C? The specific heat of aluminum is 897 J/kg·K

Explain how plate tectonics have changed earth’s surface over time. include the role of plate tectonics in the creation of landforms.

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.