Igneous Rock is formed when a magma cools underground and crystallizes or when it erupts unto the surface of the ground, cools and crystallizes. Magma that erupts onto the surface is called lava. When magma cools slowly underground the crystals are large enough to see.
Readings for compression tests usually vary between 175 to 250 PSI (Pounds per Square Inch). A higher reading generally indicates better engine performance; however you should check your vehicle manual to find out what the ideal reading should be for your vehicle.
What is the average cost to rebuild an engine? A: The average cost to rebuild an engine is typically $300 to $1,200. An older air-cooled engine is on the low end of the scale, while small block eight-cylinder engines are higher in price. An engine needing block and head machine work adds to the price. Continue Reading.