Focus 2 - unit 2

someone who works to protect the environment from the damaging effects of human activity:

(a)  

someone who studies the buildings, graves, tools, and other objects of people who lived in the past:

(a)  

a region in space where gravity is so strong that nothing, not even light, can escape:

(a)  

(of weather, conditions in a room, or parts of the body) cold:

(a)  

needing to drink:

(a)  

the study of organisms that live in the sea or ocean, their behaviors and interactions with the environment.

(a)  

the study of the Earth, the materials of which it is made, the structure of those materials, and the processes acting upon them:

(a)  

a computer program that makes it possible for you to read information on the internet:

(a)  

lasting for a long time or for ever:

(a)  

pieces or parts of something that continue to exist when most of it has been used, destroyed, or taken away:

(a)