The Russian for "density " is "прочность":
The Russian for "extensive" is "обширный":
The Russian for "health" is "здоровье":
The Russian for "international" is "международный":
The Russian for "leisure" is "отдых":
The Russian for "mainly" is "просто":
The Russian for "popular" is "популярный":
The Russian for "scale" is "скала":
The Russian for "warming" is "потепление":