Question

part e: the data table shows the average date of the first breakup of ice on the tanana river in alaska.

data table
decade | average date of first ice breakup
1960-1969 | may 7
1970-1979 | may 5
1980-1989 | may 4
1990-1999 | april 29

1. what trend in climate change is demonstrated by this data?
2. would a line graph or a bar graph be a better choice to represent this data?

part f: base your answers to questions 3 through 6 on the data table below:

name of galaxy | distance (million light - years) | velocity (thousand km/s)
virgo | 70 | 1.2
ursa major 1 | 900 | 15
lao | 1100 | 19
bootes | 2300 | 40
hydra | 3600 | 61

one light - year = distance light travels in one year

1. on the grid below, use an x to plot the distance and velocity for each galaxy from the data table to show the relationship between each galaxy’s distance from earth and the velocity at which it is moving away from earth. connect the xs with a smooth line.

velocity versus distance
grid with y - axis (thousand km/s) from 30 to 80, x - axis (distance) not labeled, but grid lines

Explanation:

Part E

Question 1

The average date of first ice breakup is getting earlier (from May 7 in 1960 - 1969 to April 29 in 1990 - 1999), indicating a warming trend (earlier ice breakup suggests warmer temperatures).

A line graph is better for showing trends over time (decades here) as it can clearly illustrate the change in the average date of ice breakup across successive decades. Bar graphs are better for comparing discrete categories, while line graphs emphasize continuous change over a variable (time) with ordered categories (decades).

Answer:

The data shows a trend of climate warming, as the average date of the first ice breakup on the Tanana River is occurring earlier over each decade (from May 7 in 1960 - 1969 to April 29 in 1990 - 1999).

Question 2