The upper mantle is harder than the lower mantle
In control data analysis, the difference between these two limits is called the range.
The upper course of a river is characterized by steep gradients, fast-flowing water, and features such as waterfalls and rapids, typically found in mountainous or hilly regions. In contrast, the lower course has a gentler gradient, slower-moving water, and broader floodplains, often exhibiting meanders and deltas as it approaches its mouth. The upper course primarily focuses on erosion and sediment transport, while the lower course is more about sediment deposition and shaping the landscape.
mesophyll layer
the upper course, closest to the mountains and hills; the middle course, between the upper and lower courses; the lower course, the flattest area close to the sea.
The ozone forming in lower atmosphere is bad. Downside the upper atmosphere one is good.
the difference between cello and viola music is that cello sounds lower then viola
lower course
Degrees from online course schools are generally looked at as slightly lower than those from in class schools. However, the difference in between the way they are regarded is not very high.
a great piano has lower notes
The Upper Creek Indians oppsed American expansion and Lower accepted it.
The coarse adjustment knob is used to raise or lower the body tube to bring the specimen into general focus.