1. name three different physical characteristics you can use to distinguish quartz from calcite.
2. what diagnostic property is most useful for discriminating between amphibole/hornblende and biotite?

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.