add two other lectures

docs/lectures/others/glacial_cycles/W10_assignment_glacial_cycles.ipynb

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+   "source": [
+    "# Glacial Cycle Assignment\n",
+    "\n",
+    "Your assignment is conduct spectral analysis on different portions of the Lisecki and Raymo (2005) benthic oxygen isotope data to determine the period of glacial-interglacial cycles. Choose at least 4 different intervals to look at with each analyzed interval being >500,000 years. A good place to start will be to look at data from the 800,000 years and compare it to data from the 800,000 to 1,600,000 year (remember 1000 years ago is 1 ka).\n",
+    "\n",
+    "Go ahead and filter the data between for these different times, plot the data and determine what frequencies have significant spectral power. **(12 points)**"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
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+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "After you have done your analysis, you will find that there are different periods for the more recent glacial-interglacial cycles than the more recent ones. \n",
+    "\n",
+    "When did this transition happen? **(2 points)**\n",
+    "\n",
+    "*write answer here*\n",
+    "\n",
+    "What is the period of the more recent glacial-interglacial cycles? What orbital forcing might it correspond to? **(2 points)**\n",
+    "\n",
+    "*write answer here*\n",
+    "\n",
+    "What is the period of the more ancient glacial-interglacial cycles? What orbital forcing might it correspond to? **(2 points)**\n",
+    "\n",
+    "*write answer here*\n",
+    "\n",
+    "This change in glacial-interglacial cycle period is often called the mid-Pleistocene transition. Using Google Scholar, find a paper that presents a hypothesis for what caused the transition. Provide the reference here and write a paragraph summarizing the hypothesis **(6 points)**\n",
+    "\n",
+    "*write answer here*"
+   ]
+  }
+ ],
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