M ộ t canô xuôi dòng t ừ b ế n A đế n b ế n B v ớ i t ố c độ v 1 = 30km/h; r ồ i ng ượ c dòng t ừ B v ề A v ớ i t ố c độ v 2 =20km/h. Tính t ố c độ trung bình trên l ộ trình đ i – v ề c ủ a canô

answer and explanation;

composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock while texture refers to the size and arrangement of the minerals or grains that make up a rock. both composition and texture can be used to classify rocks, such as igneous rocks. texture describes how the rock became solid or crystallized from liquid, melted rock. composition of a rock describes the minerals that make up a particular rock.

For me a person with a phd and who knows what there talking about.i know the chances of a radiation leak is low but if it does the area within a 96.3 mile radius would be unusable because of contamination