abbeyseiberling abbeyseiberling

01-06-2017
Social Studies

contestada

Scientists determined the historic levels of carbon dioxide in the Earth’s atmosphere by _____.

1. testing air bubbles in Antarctic ice

2. testing soil samples all over the world

3. evaluating tree ring growth

4. mapping the growth of redwood trees

Respuesta :

nicasivantniknik229 nicasivantniknik229

01-06-2017

I would say choice one, testing air bubbles in antarctic ice.

Answer Link

Otras preguntas

When Mendel crossed two hybrid plants for stem height (Tt), what results did he always get?

what are the constants of t-shirts

Climate warming trends allow plant and insect species to inhabit larger ranges. True or false?

during a _____ change a system absorbs energy from its surroundings

what is 3,256,423,865 rounded to the nearest million?

How do say 6:45 a.m. in how Spanish

ben has 3 times as many guppies as goldfish. if he has a total of 20 fish, how many guppies does in have

how do 7.6 be written in word form

what was not the cause of the great depressiona. overproduction b. stock speculation c. under consumption d. foreign competition

ammar hikes 23/4 miles of nature trail in 1 hour and 15 min .How many miles of trail does ammar hike per hour? pleas help me to understand this