Researcher have stumbled across four giant underwater mountains during a mapping expedition from Costa Rica to Chile.

What is the meaning of ‘expedition’ ? 

A journey or voyage undertaken by a group 

This previously hidden range boasts eight dormant volcanoes, towering up to 2.7 km high.

What is ‘dormant’ ? 

The team used mapping to chart the ocean with marine technicians and hydrographic experts. 

Define ‘hydrographic’ :

Only 1/5 of the ocean floor has been mapped; a vast majority of seamounts have not been explored.

What is ‘seamount’ ?

An underwater mountain with steep sides rising from seafloor

These underwater mountains and trenches are understudied biodiversity hotspots, serving as habitats for myriad of sea creatures.

What is ‘myriad’ ? 

An ambitious effort is underway to map the entire ocean floor by 2030.

What is ‘ambitious’ : 

Showing a strong desire or determination 

Researcher have stumbled across four giant underwater mountains during a mapping expedition from Costa Rica to Chile. What is the meaning of ‘expedition’ ?