Earth Sciences in our life: Part 2 Now we have the materials to build a house, but where exactly we should do it? Engineering geology analyses all sites thought to be suitable and decides is it a good or bad place. For example, if we choose the place near river that---as hydrological study revealed---floods its flood-plain every spring, our place is obviously bad, even from a common sense viewpoint. If we choose a site near the edge of a steep slope composed by sands or clays, it's also a bad place, because a landslide may occur here and the house would be in danger. The other reason against building at either of the sites mentioned above may be a high seismicity of the region where we plan to build. Shaking even from a relatively weak earthquake is felt much better at loose grounds like alluvial rock in the flood plain or sand/clay are. It also can damage the materials of which our house is built. So hard rocks are generally better, in terms of earthquake engineering, to construct anything on them. But still not all hard rocks are good enough for building. Certain rocks, seemingly hard at first sight, can be washed away and dissolved by simple rainwater. This phenomenon is called karst. It is still dangerous if karst rocks are not exposed to the surface, but occur at certain depth: they may be gradually dissolved or washed away for many years and cause sudden collapse of the overlying layers with the constructions upon them. The same may happen if not to take into account the ground pressure when mining or underground building. So the respective knowledge from Earth Sciences helps builders and miners to make the resultant constructions as safe as possible. I've considered here perhaps the brightest examples of how different Earth Sciences can invisibly affect our everyday lives. But more can be found besides them. If to remember that everything is interrelated, one can find many intersections between the Earth Sciences and other fields of knowledge seemingly far from it.