(v.) - to watch something carefully and record your observations
preserve
observe
monitor
(v.) - to keep something the same or prevent it from being damaged or destroyed
resources
preserve
satellite
(n.) - the action of going around a place where you have never been in order to find out what is there
launch
exploration
investigation
(ph. v.) - to finish a supply of something
surface
use up
atmosphere
(ph. v.) - to discover something or meet someone by chance
exploration
come across
atmosphere
(n.) - the layer of gases around the Earth
use up
atmosphere
surface
(v.) - to send a spacecraft into the sky, or a ship into the water
monitor
launch
investigation
(n.) - a group of plants or animals that share similar characteristics
use up
species
surface
(n.) - a piece of equipment that is sent into space around the Earth to receive and send signals or to collect information
species
satellite
surface
([pl.] n.) - something that a country, person, or organization has that they can use
satellite
resources
species
(n.) - the action of trying to discover all the facts about something
launch
monitor
investigation
(v.) - to watch someone or something carefully
observe
resources
preserve
(n.) - the top or outside part of something
come across
use up
surface