diff --git a/macrovision.js b/macrovision.js
index 243fb6b4..990cfc10 100644
--- a/macrovision.js
+++ b/macrovision.js
@@ -779,6 +779,25 @@ function drawVerticalScale(ifDirty = false) {
         drawAltitudeLine(ctx, math.unit(7.5, "meters"), "Littoral Zone");
         drawAltitudeLine(ctx, math.unit(140, "meters"), "Continental Shelf");
     }
+        
+    if (config.drawAltitudes == "geology" || config.drawAltitudes == "all") {
+        drawAltitudeLine(ctx, math.unit(35, "km"), "Crust");
+        drawAltitudeLine(ctx, math.unit(670, "km"), "Upper Mantle");
+        drawAltitudeLine(ctx, math.unit(2890, "km"), "Lower Mantle");
+        drawAltitudeLine(ctx, math.unit(5150, "km"), "Outer Core");
+        drawAltitudeLine(ctx, math.unit(6370, "km"), "Inner Core");
+    }
+        
+    if (config.drawAltitudes == "thicknesses" || config.drawAltitudes == "all") {
+        drawAltitudeLine(ctx, math.unit(0.335, "nm"), "Monolayer Graphene");
+        drawAltitudeLine(ctx, math.unit(3, "um"), "Spider Silk");
+        drawAltitudeLine(ctx, math.unit(0.07, "mm"), "Human Hair");
+        drawAltitudeLine(ctx, math.unit(0.1, "mm"), "Sheet of Paper");
+        drawAltitudeLine(ctx, math.unit(0.5, "mm"), "Yarn");
+        drawAltitudeLine(ctx, math.unit(0.0155, "inches"), "Thread");
+        drawAltitudeLine(ctx, math.unit(0.1, "um"), "Gold Leaf");
+        drawAltitudeLine(ctx, math.unit(35, "um"), "PCB Trace");
+    }
 }
 
 // this is a lot of copypizza...
@@ -2077,7 +2096,9 @@ const settingsData = {
             "atmosphere",
             "orbits",
             "weather",
-            "water"
+            "water",
+            "geology",
+            "thicknesses"
         ],
         get value() {
             return config.drawAltitudes;