__________ Record a Tree's Growth Depending on Climate

Q13: The Little Ice Age lasted from about

Q14: The ocean has become more acidic in

Q15: In Earth's history, the concentration of carbon

Q16: The four industrial greenhouse gases are _

Q17: The Sun produces energy by _ _.

Q19: The Mesozoic was a relatively warm era.

Q20: Greenhouse gases:<br>A) block infrared radiation and prevent

Q21: Ice core records from Greenland indicate that

Q22: Many organisms absorb a high ratio of

Q70: The Sun was _ percent fainter early