P2.U7

To explode; to break out with force

• erupt
• remain
• stay
• settle

Invisible line that marks the extent of a state's territory

• boundary
• center
• interior
• core

A sudden violent movement of the earth's surface, sometimes causing great damage

• earthquake
• stability
• stillness
• calm

Area

• zone
• whole
• entirety
• unbounded space

A substance that becomes hard as it dries and is used for smooth surfaces

• plaster
• rough surface
• dirt
• rubble

A physical substance that things can be made from

• material
• immateriality
• abstraction
• nonentity

To move backward and forward or up and down in quick, short movements

• shake
• still
• stabilize
• steady

To make something stronger

• reinforce
• weaken
• diminish
• reduce

The dried, yellow stems of crops such as wheat

• straw
• fresh plant
• greenery
• sprout

To be inside or within something

• enclose
• exclude
• release
• open