I think its D im not sure hope this helped
<span>Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion. They are the energy that travels through the earth and is recorded on seismographs.
Source: OS</span>
Answer:
Navigable rivers and geographical conditions.
Explanation:
Rivers and moderate distances between the countries have been an advantage for Europe because it makes it easy to transport goods all across the realm. Rivers and canals provided transportation routes for goods and people. Rivers use to transport goods between coastal harbors and the inland, aiding economic growth, and they bring people and goods together.
The railroad tracks are parallel, because they go the same direction and don't intersect
