updated seis activity

docs/lessons/seismograph/activity.md

@@ -16,11 +16,15 @@ Engineering: In this project, you will build your own seismograph micro:bit from
 * Tape 
 * Scissors
 
-Step 1. Prepare Tape: Measure and cut approximately 10mm of tape. The tape will be fastened to a micro USB cable.  
+## Step 1. 
+
+Prepare Tape: Measure and cut approximately 10mm of tape. The tape will be fastened to a micro USB cable.  
 
 ![](/static/mb/lessons/seismograph1.png)
 
-Step 2. Fasten Tape: Fasten tape to the micro USB cable and to the plate. Attach the micro:bit to the micro:bit USB cable. 
+## Step 2. 
+
+Fasten Tape: Fasten tape to the micro USB cable and to the plate. Attach the micro:bit to the micro:bit USB cable. 
 
 ![](/static/mb/lessons/seismograph0.png)
 
@@ -30,12 +34,14 @@ Computer Science: The seismograph has been built. We are ready to program the mi
 
 ### ~
 
-Step 1. Go to Codemicrobit.com
+## Step 1. 
+
+Go to Codemicrobit.com
 
 * Click or tap New Project
 * Click or tap Blocks
     
-Step 2. 
+## Step 2. 
 
 We will measure `acceleration (mg)` in terms of strength or Magnitude. Get the acceleration value (milli g-force), as measured in strength or Magnitude.
 
@@ -43,7 +49,7 @@ We will measure `acceleration (mg)` in terms of strength or Magnitude. Get the a
 input.acceleration(Dimension.Strength);
 ```
 
-Step 3. 
+## Step 3. 
 
 Use the plot bar chart to visualize the acceleration on the LED screen of the micro:bit in the specified range. You implement forever and plot Bar Graph to constantly display a vertical bar graph, which will be based on the "value" and "high" value. Then measure the acceleration based on the strength or Magnitude. 
 
@@ -54,9 +60,7 @@ basic.forever(() => {
 
 ```
 
-### ~
-
-Step 4. 
+## Step 4. 
 
 Finally, we subtract the gravity from acceleration strength. 
 
@@ -76,22 +80,20 @@ Science: We now need to use the micro:bit to chart the strength of the accelerat
 ### ~
 
 
-Step 1. 
+## Step 1. 
 
 First, notice that making moving the micro:bit simulator in any direction will change the values from a flat horizontal line to a waving line to display the value of the strength as measured in milli-gravities. Next, notice that by moving the micro:bit simulator below, there is a changing acceleration value. Finally, notice that the LED display will fluctate based on the movement of the micro:bit simulator. 
 
 ![](/static/mb/data4.png)
 
-### ~
-
-Step 2. 
+## Step 2. 
  
 Vigorously move the micro:bit in the micro:bit simulatator by moving the micro:bit image from side to side. Every time the micro:bit moves in any direction in the simulator,  you are generating data points that can be reviewed in Excel. The more attempts to move the micro:bit from side to side, the more data being saved in Excel. After you have vigarously moved the micro:bit simulator from side to side for a sufficient amount of time, you are ready to graph or chart the accceleration of the micro:bit. We want a printout of our acceleration on Excel that can be graphed in Excel. 
 
 
 ### ~
 
-Step 3. 
+## Step 3. 
 
 * Connect a micro:bit to your computer using your USB cable
 
@@ -109,9 +111,7 @@ Run the acceleration experiment by moving the actual micro:bit and observe the c
 
 First, notice that by moving the actual micro:bit in any direction, you will change the values of the black, flat horizontal line. The black line will change from being flat to being a waving black line. The changing values of the micro:bit accelereration is being measured in milli-gravities. Next, notice that by moving the micro:bit  below, there is a changing acceleration value. Finally, notice that the LED display will fluctate based on the movement of the micro:bit. 
 
-### ~
-
-Step 4. 
+## Step 4. 
 
 We want to chart the data collected by using a tool in Excel. 
 
@@ -121,9 +121,8 @@ First, click or tap on the first two columns (A, B) to  include the time of the
 
 ![](/static/mb/data7.png)
 
-### ~
 
-Step 5. 
+## Step 5. 
 
 ![](/static/mb/chart1.png)
 
@@ -141,17 +140,14 @@ When you find the chart type that you want, click it, and then click OK. We want
 
 Tip: If you don’t see a chart type that you want, click the All Charts tab to see all of the available chart types.
 
-### ~
-
-Step 6. 
+## Step 6. 
 
 ![](/static/mb/chart_title.png)
 
 * Use the Chart Elements, Chart Styles, and Chart Filters buttons next to the upper-right corner of the chart to add chart elements like axis titles or data labels, to customize the look of your chart
 
-### ~
 
-Step 7. 
+## Step 7. 
 
 ![](/static/mb/elements_styles_filters.png)