Homework #1      20 Questions in Boulder Creek  Due date Monday 14 April 5 pm.

You will need a tape measure, a pencil, a penknife or nailfile,  this piece of paper anda scantron sheet for this homework.  You may also need your text book if you are to identify the minerals correctly.  Starting on the Boulder bike path below and to the east of the 17th street bridge you will find a large boulder between you and the stream on which is inscribed a memorial to Fred and Kate Watts:

1. What type of rock is this?
a. sandstone    b  conglomerate     c.gneiss     d. granite      e. schist

2. What is the pink mineral in this rock?
a. quartz     b. feldspar    c. garnet     d.  biotite   e. muscovite

3. Two stone benches are constructed in the picnic area to the east of this large boulder.  From what rock are the supports to the bench parallel and  next to the stream cut?
a. sandstone    b.  conglomerate     c.gneiss    d. granite       e. schist

4. What three minerals can you see clearly in the horizontal beam of this bench?
a. quartz biotite feldspar      b quartz  muscovite feldspar    c    feldspar biotite augite   d biotite sillimanite  garnet       e garnet mica  galena

5. The second bench to the NE of this first bench is constructed from igneous rocks with different grain size.  What are they?  a. granite and rhyolite    b. granite and granite    c. granite and basalt    d. basalt and gabbro   e. rhyolite and dolerite.

6.  What kind of device was used to cut this bench into shape?    a. chain saw     b Helium/Neon laser    c diamond saw       d gypsum saw     e steel saw

7. What is the weight of the horizontal block of this bench?  Density of the rock is 2.7 gm/cc.  Weight is the volume of the rock times its density.  a. 50 kg    b 70 kg   c 90 kg    d 120 kg   e 170kg

8. From what kind of rock are the square stone flagstones cut?   a. sandstone    b  limestone     c.gneiss     d. granite      e. schist

9. Walk to the next bridge east. What is the primary rock needed to form the Boulder creek bike path   a. sandstone    b.  mudstone    c.limestone    d. shale      e. serpentinite

10. There are two stones on either side of the path leading to the north, between the "adopt a stream" sign and the wire fence that marks the corner of the playground.  The most westerly rock is a   a. sandstone    b.  conglomerate     c.gneiss     d. granite      e. schist

11. The boulder to the east is  a. sandstone   b.  conglomerate   c.gneiss   d. granite   e. schist

12.  Now cross the bridge and walk south under the steam pipe heading for the curious fireplace built from stone next to the hillside.  A very large boulder is embedded just to its south.  The rock that this boulder is made from is  a. sandstone    b.  conglomerate     c.gneiss     d. granite      e. schist

13.  Three very large boulders are visible to the E and ESE of this huge boulder lying on the surface of the flood plain.  How did they get here?   a. they are glacial erratics   b. they were placed here by Boulder City to beautify the river bank  c. they are the result of normal overbank floods.  d. they result from a glof    e. they rolled down the cliff from the University.

14. The first of these boulders is light colored.  What type of rock is it?    a. sandstone    b.  conglomerate     c. gneiss     d. granite      e. schist

15. The second of these boulders is reddish colored.  What type of rock is it?   a. sandstone    b.  conglomerate     c.gneiss     d. granite      e. schist

16.  What is the large mineral at the very top of this boulder? a. gypsum   b. quartz   c.  halite    d. feldspar    e. calcite

17. The third of these boulders is greyish-colored  What is the feature you see in this rock?    a. basalt dike   b. a granite dike    c. sedimentary stratification   d. base of magma chamber    e. columnar jointing? 

18. A rock with a plaque in memory of Ruth Leinbach has a bench next to it. From what rock is the bench cut  a. red quartz   b. red granite  c garnet schist  d. gabbro  e. arkose 

19. What kind of climate is likely to have prevailed when this rock was formed?        a. tropical forest    b deep ocean mud       c laterite     d. temperate and windy       e desert

20. Measure the width, depth and velocity of the Boulder Creek.  What is its discharge in m3/s   ?     
          a. 0.01         b. 0.1            c. 1            d. 2                e . 10

Write your name and number on the scantron sheet.
Indicate the date and time you visited Boulder Creek in the blank space on the sheet of paper.
Submit the homework by 5 pm Monday 14 April 2008- any time sooner is OK.
Homeworks submitted after this date will score zero.