What did scientists believe was the cause of the hole in the ozone layer?
a. cars
b. aerosol sprays
c. acid rain
d. pump spray bottles

The larges lakes in the world are found in: asia europe north america south america

What forms of energy are involved when snow on a mountain breaks loose, resulting in an avalanche? during an avalanche, the( 1 ) energy of the snow on the mountain is converted into ( 2 ) energy as the snow cascades down. ( 1 ) a. elastic b. kinetic c. potential d. radiant ( 2 ) a. chemical b. kinetic c. nuclear d. potential

Where was oil production at its highest in the 1980s and still remains important to the russian economy? central asia the ural mountains russian siberia the caucasus region