The two main sources of human-generated aerosols are _______…

We now live in the ________ era.

The 2013 IPCC report states that if there is a doubling of p…

Proxy data for detecting climate change comes from ________.

The two main sources of human-generated aerosols are _______…

We now live in the ________ era.

When a radioactive isotope decays by electron capture, the e…

________ is an erosional contact between tilted, older strat…

________ is(are) produced by anaerobic bacteria.

________ is(are) produced by anaerobic bacteria.