1
2
100

 to remember and show respect for something

commemorate 
100

 the spread of people, ideas, technology, and products from one culture to another

cultural diffusion 

200

 the combined continental landmass of Europe and Asia

Eurasia 
200

 to join together

unify

300

 to give in to something

succumb 

300

the quality of being more merciful or forgiving than necessary

leniency

400

 someone who moves from place to place rather than settling permanently in one location

nomad

400

to cause someone to be more inclined toward a specific action, belief, or condition

predispose 

500

 a stone slab with writing that commemorates major historical events or people

stele

500

 having no pity or care for others; cruel

ruthless

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