Match the layer of the Earth in column 1 to the characteristic in column 2. Inner core
?
Faults, plates
Crust
?
Heat convection
Mantle
?
Solid iron
Outer core
?
Liquid iron

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health?

Why have the countries of the region had difficulty establishing democratic governments in recent years? choose all answers that are correct b is also correct i need to know if theres any morecommunists have overtaken the countries of the caucasus region. the soviets established national borders in the region without considering the location of ethnic groups. fighting continues between armenia and azerbaijan over the nagorno-karabakh region. civil war between communists and islamic groups in tajikistan resulted in thousands of deaths and refugees are forced to flee. in a test!

[ou.01jthe greatest speed with which any physical object moves is 300,000 km/soundsec. which of the following has a speed of 300,000 km/sec? a.light in water b.light in vacuum c.sound in air. d. sound in water