Question

which of the following is a result of chemical weathering?
a glacier carving a valley
rust forming on a rock
wind moving sand dunes
an earthquake cracking a road
question 21
0.4 pts
which of earths spheres includes all living things?
lithosphere
atmosphere
biosphere
hydrosphere

Explanation:

• Chemical weathering involves chemical reactions that change the composition of rocks. Rust forming on a rock is a chemical - reaction (oxidation) between iron in the rock and oxygen in the air, which is a result of chemical weathering. A glacier carving a valley is physical (mechanical) weathering, wind moving sand dunes is an example of erosion, and an earthquake cracking a road is related to tectonic forces.
• The biosphere is the part of Earth that includes all living things. The lithosphere is the solid, outer part of the Earth, the atmosphere is the layer of gases surrounding the Earth, and the hydrosphere is all the water on Earth's surface.

Answer:

• First question: B. Rust forming on a rock
• Second question: C. Biosphere