Do Sedimentary rocks sink or float?

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health?

In which direction does the moving force of air flow? a-from warm temperatures to cold temperatures b-to areas of high pressure to areas of low pressure c-east to west d-from high elevations to low elevations

Como se presentan los personajes de cunshi y su pequeño hijo? describe a cada uno de ellos