Past climate change in the N. Atlantic is examined using what?

Question

I have the following options:

-Ocean sediments and ice cores

-ocean sidemtns only

-ice cores only

-satellite remote sensing observations

Answer 1

hint; it cant be satellites can it?

Answer 2

sediment and ice cores

Answer 3

THE GOVERNMENTS HIND SIGHT==THE SCIENTIST== THATS WHY THEY CAN ONLY TALK ABOUT IT EVERY OTHER 3 MONTHS. THIS IS WHY THEY HAVENT DONE ANYTHING MANUAL.

Answer 4

Ocean sediments