energy sources Flashcards Preview

9th Earth Science A-G > energy sources > Flashcards

Flashcards in energy sources Deck (20):
1

Three advantages to using biomass as fuel are

it has large potential in some areas,
plantations can help restore lands that are degraded
it can make use of agricultural and urban waste products

2

What is the best free energy source?

Solar

3

What is the main leading source of renewable energy?

hydropower

4

Wind power and water power both generate electricity by turning ____ _________ and _____ ______

turbines and generators

5

___ is not a benefit to using geothermal energy.

non-toxic emissions turn into water vapor

6

A very controversial form of energy is ________________ power.

nuclear

7

One of the benefits to conventional oil is _______________

it has a high net energy yield

8

_____ is not an advantage of nuclear power

there is a high net energy yield

9

Some of the problems with coal include ______________________.

it has high CO2 emissions when it is burned,
it is a severe threat to human health

10

Synthetic fuels are ________- made energy sources

man

11

what is weathering?

the changing of rocks at the Earth's surface due to exposure to certain variables

12

when water freezes it expands

10%

13

The heating and cooling of rocks causes them to expand and contract. When this happens, pieces of rock flake off in a process called _________________________. It can also happen from pressure being released on the surface.

exfoliation

14

carbonic acid

is a weak acid that occurs naturally

15

A marble statue is in a botanical garden near a factory that produces sulfur dioxide. What will most likely happen to the statue over time?

the statue will start to deteriorate due to the effects of acid rain

16

What are two forms of physical weathering?

wind and gravity

17

Underground caves form from ________________________.

water seeping down, forming carbonic acid, dissolving the limestone

18

In what type of environment would limestone be chemically weathered?

moist and hot; moist and cold

19

When lichen and moss grow on rocks they begin the process of ____________.

biological weathering due to pressure

20

How do giant piles of rounded rock form?

they get cracks from freeze - thaw cycles;
they become more rounded through exfoliation;
clay minerals in the rock wash away;
they experience ice wedging;
flash floods wash away the rock debris in between;
wind blows away smaller fragments