Answer:
The Geologic Time Scale is a system of chronological measurements that relates to the study of rock and layers.
While the human time scale is the portion of the pedogenic time scale that covers periods of centuries, decades, or less.
Explanation:
The amplitude of S waves do not decrease as the depth increases while Vertical waves do.
Answer:
The seismic method of exploration are based on the elastic wave propagation
Explanation:
- The seismic methods depend on the velocity of acoustical energy in earth materials i.e generation of pulse waves. The wave theory of time travel and reflection, deflection and absorption are applied to the principal methods of gravity and electric technique.
- Some convectional geophysical techniques are derived and defined as
1. Near-surface applications: For understanding the geology of rocks at greater depths for engineering and environmental studies.
2. Hydrocarbon exploration: For the discovery of various oils and petroleum reserves.
3. Mineral exploration: geologic mapping and geochemical exportation of the ocean deeps.
4. Crustal studies: like the origin of the earth and slabs of rocks for studying the discontinues in earth at various layers.
The correct is - (b) the African plate is spreading apart to form two separate plates.
The African tectonic plate, on of the biggest ones, but it will not be like for a long time in the future as the plate is separating into two parts. The eastern part of the plate is moving towards east, and it is moving away from the mainland Africa. Because of this movement, cracks have been forming all over the eastern side of Africa, thus the numerous faults. Over time, as the distance is increasing, the space in between will fill with ocean water, thus making a natural barrier between them, as well as setting the foundations for the creation of a new sea, or maybe even an ocean.
