How does earth asthenosphere contribute to movement of the plates.

What is the approximate circumference of the circle shown below? 12.2 cm

You have been tasked with sorting the rock samples shown into three categories, with two rocks in each category. what attribute would you use to sort these rocks? which rocks would be in each category? rocks: obsidian, coquina limestone, granite, soapstone,pumice, and gneiss.

In a command economy, the majority of goods and services are provided by the