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[Relative and Numerical Dating] Let’s look at a simple cross section. Here we see where a dike has intruded into some sediments. Using the principles of relative dating, label the five rock units from the oldest (1) to the youngest (5). If this is completely new to you, check out this interactive animation for a full explanation. RELATIVE AGE DATING

[Earthquakes] Brittle deformation results in faulting. The type of fault produced depends on the type of stress applied to the rock. In the animation below, select the “Types of Faults” menu and watch each part. Use the information from it to label the four images below with the appropriate name for the type of fault shown. “Types of Faults”

[Earthquakes] Rocks deform in response to applied stress. Deformation is usually either brittle or ductile. Earthquakes occur when rocks deform in a brittle fashion. Select the images below that represent brittle deformation.

[Oceans] Ocean currents circulate the water within the Earth’s oceans. These currents are powered by several different forces. Watch the following video on ocean currents and then select the main driving forces of ocean currents from the choices listed below. video on ocean currents  

[Relative and Numerical Dating] Dating is complicated by the presence of unconformities. An unconformity is a gap left in the rock record due to erosion or lack of deposition. It is not a physical cavity but rather an uneven contact between beds of different ages. Label the three images below with one of the types of unconformities provided.

[Oceans] The following graph shows oceanic water temperature with reference to depth for equatorial, tropical, and polar (high latitude) waters. Select the line that represents the highest surface temperature.

[Earthquakes] Now, match the name of the seismic wave with the appropriate block diagram showing wave motion.

[Relative and Numerical Dating] Fossils can be dated using isotopic dating. Suppose the index fossil had a parent:daughter ratio of 4:12. Use the graph below to determine how many half-lives elapsed.

[Relative and Numerical Dating] To understand many of the geological processes that occur or have occurred throughout time, geologists need to be able to put rocks of different ages into order. The two main ways that geologists do this are through relative dating and numerical dating. We will be using these terms a lot throughout this exercise. Match these terms with their definitions.

[Ocean and Coastal Processes ] Beach erosion from storm surges and daily wave activity is a serious problem in many coastal communities. In an effort to stabilize coastlines, engineers design and install hardened structures such as the ones shown in the animation below. Select “Topics” and watch each animation. Living with the Coast Now, label the three images shown below.